Description<\/h3>\n
Heavy fermion systems are a class of strongly correlated electron systems in which charge carrier can have masses as large 1000 times the free electron mass. This large effective mass often derives from f orbitals of rare earth or actinide atoms. The ground state of heavy fermions is easily tuned and controlled with an external thermodynamic parameter. For instance, magnetic phases can be suppressed at a quantum phase transition with pressure or magnetic field.<\/p>\n
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[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Annuaire” module_id=”personnel” _builder_version=”4.26.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Research staff<\/h3>\n
[\/et_pb_text][et_pb_code _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”]
![\"DE](\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/05\/Albin_DEMUER.jpg\")
<\/a><\/figure><\/div>DE MUER Albin<\/a><\/span><\/h3>Associate professor<\/a><\/div>- <\/i>Grenoble<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
![\"SEYFARTH](\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/07\/Gabriel_SEYFARTH.jpg\")
<\/a><\/figure><\/div>SEYFARTH Gabriel<\/a><\/span><\/h3>Associate professor<\/a><\/div>- <\/i>Grenoble<\/span><\/li><\/ul><\/div><\/div><\/div><\/div>
![\"SHEIKIN](\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/07\/SHEIKIN-225x300-1.jpg\")
<\/a><\/figure><\/div>SHEIKIN Ilya<\/a><\/span><\/h3>Researcher<\/a><\/div>- <\/i>Grenoble<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ fullwidth=”on” admin_label=”Actus” module_id=”actualites” _builder_version=”4.26.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_fullwidth_post_slider posts_number=”5″ include_categories=”480″ excerpt_length=”100″ show_meta=”off” use_text_overlay=”off” _builder_version=”4.27.2″ _module_preset=”default” header_font=”Verdana|700|on||||||” header_text_align=”left” header_font_size=”35px” body_font=”–et_global_body_font||||||||” body_text_align=”left” body_font_size=”16px” body_line_height=”1.4em” background_color=”#FFFFFF” custom_button=”on” button_text_size=”15px” button_border_radius=”100px” button_font=”Verdana||||||||” button_alignment=”left” width=”70%” module_alignment=”center” content_width=”100%” height=”300px” height_tablet=”300px” height_phone=”350px” height_last_edited=”on|phone” max_height=”300px” max_height_tablet=”300px” max_height_phone=”350px” max_height_last_edited=”on|desktop” custom_margin=”25px|25px|25px|25px|true|true” custom_padding=”60px||74px||false|false” auto=”on” auto_speed=”10000″ hover_transition_duration=”500ms” hover_transition_speed_curve=”ease-in” body_font_size_tablet=”” body_font_size_phone=”15px” body_font_size_last_edited=”on|phone” button_text_size_tablet=”17px” button_text_size_phone=”14px” button_text_size_last_edited=”on|tablet” custom_css_free_form=”.et_pb_more_button:hover{|| -webkit-backdrop-filter: blur(5px);|| backdrop-filter: blur(5px);|| border: solid 2px rgba(255,255,255,0.2) !IMPORTANT;|| transition: backdrop-filter ease-in-out 0.2s;||}” header_text_shadow_style=”preset1″ header_text_shadow_blur_strength=”1em” border_radii=”on|25px|25px|25px|25px” border_color_all=”#FFFFFF” button_text_shadow_style=”preset1″ button_text_shadow_blur_strength=”1em” box_shadow_style=”preset3″ box_shadow_blur=”23px” box_shadow_spread=”-30px” box_shadow_style_button=”preset1″ global_colors_info=”{}” box_shadow_blur__hover_enabled=”on|desktop” box_shadow_vertical__hover_enabled=”on|hover” box_shadow_vertical__hover=”10px” box_shadow_blur__hover=”25px” box_shadow_spread__hover=”-10px” box_shadow_spread__hover_enabled=”on|hover”][\/et_pb_fullwidth_post_slider][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Voir les posts” _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” link_option_url=”https:\/\/lncmi.cnrs.fr\/category\/fermions-lourds” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_button button_url=”https:\/\/lncmi.cnrs.fr\/category\/fermions-lourds\/” button_text=”See all articles” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”16px” locked=”off” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Th\u00e8mes de recherche” module_id=”themes” _builder_version=”4.26.0″ _module_preset=”default” background_color=”rgba(0,0,0,0.02)” global_colors_info=”{}”][et_pb_row column_structure=”1_4,1_4,1_4,1_4″ _builder_version=”4.25.2″ _module_preset=”default” module_alignment=”center” global_colors_info=”{}”][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Topics<\/h3>\n
[\/et_pb_text][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Unconventional_superconductivity-1024×803.jpg” title_text=”Unconventional_superconductivity” _builder_version=”4.27.4″ _module_preset=”default” width=”340px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Unconventional superconductivity<\/p>\n
[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Quantum_Critical_Points-1024×740.jpg” title_text=”Quantum_Critical_Points” _builder_version=”4.27.4″ _module_preset=”default” width=”315px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” max_width=”340px” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” custom_padding=”|0px||||” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Quantum Critical Points<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_4,1_4,1_4,1_4″ _builder_version=”4.25.2″ _module_preset=”default” module_alignment=”center” global_colors_info=”{}”][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Magnetic_Phase_Diagrams-1024×792.jpg” title_text=”Magnetic_Phase_Diagrams” _builder_version=”4.27.4″ _module_preset=”default” width=”340px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Magnetic Phase Diagrams<\/p>\n
[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Quantum_oscillations_Fermi_surfacespng-1024×844.png” title_text=”Quantum_oscillations_Fermi_surfacespng” _builder_version=”4.27.4″ _module_preset=”default” width=”315px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” max_width=”340px” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” custom_padding=”|0px||||” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Quantum oscillations and Fermi surfaces<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”techniques” module_id=”techniques” _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Techniques<\/h3>\n
[\/et_pb_text][et_pb_toggle title=”Magnetization” _builder_version=”4.27.4″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n
\n\n\n\n\n\nContac![\"\"](\"http:\/\/srv-web.lncmi.cnrs.fr\/wp-content\/uploads\/2019\/12\/Magnet_icon.png\")
ts: GABRIEL SEYFARTH (Grenoble) : gabriel.seyfarth \u00a0[a] lncmi.cnrs.fr<\/span><\/h4>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n\n\n\n![\"\"](\"http:\/\/srv-web.lncmi.cnrs.fr\/wp-content\/uploads\/2020\/02\/Aimantation_setup.png\")
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Magnetization measurement is based on the principle of the Faraday balance, depicted above. A magnetic sample is placed on a suspended platform, inside a magnetic field gradient created by a ferromagnet. The magnetic force on the sample induces a displacement of the platform which is detected with a capacitance measurement.<\/p>\n
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Above we show an example of magnetization measurement in high magnetic field and low temperature in a Weyl semimetal. de Haas van Alphen quantum oscillations are measured up to the highest field when applied along the a-axis of the hexagonal structure.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\n\n\n\n\n\nContact: ALBIN DE MUER albin.demuer\u00a0[a]\u00a0<\/span>lncmi.cnrs.fr (GRENOBLE)<\/h4>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n\n\n![\"\"](\"http:\/\/srv-web.lncmi.cnrs.fr\/wp-content\/uploads\/2020\/03\/Cp_setup.png\")
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The specific heat measurement requires to detect a change in sample temperature upon heating it.<\/p>\n
The sample is glued on a resistive chip used as a sample holder, a thermometer and a heater. Wires with specific material, length and diameter are chosen to hang the setup, to measure the chip resistance and to provide the suitable thermal conductance depending the heat capacity of the sample. Extremities of wires are thermally connected to a thermal bath stabilized in temperature owing to a reference temperature and magnetic field calibrated thermometer.<\/p>\n
A square shape current signal is injected in the chip and the large induced temperature relaxations, as large as 100% of the bath temperature, are measured with accuracy and a high sample rate (around 1000 points over a time range from 1 to 100 s).<\/p>\n
Specific heat is then computed on the whole temperature range relaxation, providing an accurate and fast measurement suitable for high magnetic field measurement.<\/p>\n
Ideal dimensions for the sample consist of thin platelets (few hundred \u00b5m) with an area close to mm\u00b2. Good internal thermal conductivity is required for quality of the measurement. Field orientation may be chosen, in-plane or perpendicular the platelet.<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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Above we show specific heat measurements in the heavy fermion compound CePt2In7.\u00a0 At the magnetic transition an anomaly is observed in the specific heat (left). This anomaly is tracked up to high magnetic fields in order to construct the phase diagram of this material (right). Check here<\/a> for more info on theses results.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
- <\/i>Grenoble<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/a><\/figure><\/div>
SEYFARTH Gabriel<\/a><\/span><\/h3>
Associate professor<\/a><\/div>- <\/i>Grenoble<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/a><\/figure><\/div>
SHEIKIN Ilya<\/a><\/span><\/h3>
Researcher<\/a><\/div>- <\/i>Grenoble<\/span><\/li><\/ul><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ fullwidth=”on” admin_label=”Actus” module_id=”actualites” _builder_version=”4.26.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_fullwidth_post_slider posts_number=”5″ include_categories=”480″ excerpt_length=”100″ show_meta=”off” use_text_overlay=”off” _builder_version=”4.27.2″ _module_preset=”default” header_font=”Verdana|700|on||||||” header_text_align=”left” header_font_size=”35px” body_font=”–et_global_body_font||||||||” body_text_align=”left” body_font_size=”16px” body_line_height=”1.4em” background_color=”#FFFFFF” custom_button=”on” button_text_size=”15px” button_border_radius=”100px” button_font=”Verdana||||||||” button_alignment=”left” width=”70%” module_alignment=”center” content_width=”100%” height=”300px” height_tablet=”300px” height_phone=”350px” height_last_edited=”on|phone” max_height=”300px” max_height_tablet=”300px” max_height_phone=”350px” max_height_last_edited=”on|desktop” custom_margin=”25px|25px|25px|25px|true|true” custom_padding=”60px||74px||false|false” auto=”on” auto_speed=”10000″ hover_transition_duration=”500ms” hover_transition_speed_curve=”ease-in” body_font_size_tablet=”” body_font_size_phone=”15px” body_font_size_last_edited=”on|phone” button_text_size_tablet=”17px” button_text_size_phone=”14px” button_text_size_last_edited=”on|tablet” custom_css_free_form=”.et_pb_more_button:hover{|| -webkit-backdrop-filter: blur(5px);|| backdrop-filter: blur(5px);|| border: solid 2px rgba(255,255,255,0.2) !IMPORTANT;|| transition: backdrop-filter ease-in-out 0.2s;||}” header_text_shadow_style=”preset1″ header_text_shadow_blur_strength=”1em” border_radii=”on|25px|25px|25px|25px” border_color_all=”#FFFFFF” button_text_shadow_style=”preset1″ button_text_shadow_blur_strength=”1em” box_shadow_style=”preset3″ box_shadow_blur=”23px” box_shadow_spread=”-30px” box_shadow_style_button=”preset1″ global_colors_info=”{}” box_shadow_blur__hover_enabled=”on|desktop” box_shadow_vertical__hover_enabled=”on|hover” box_shadow_vertical__hover=”10px” box_shadow_blur__hover=”25px” box_shadow_spread__hover=”-10px” box_shadow_spread__hover_enabled=”on|hover”][\/et_pb_fullwidth_post_slider][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Voir les posts” _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.25.2″ _module_preset=”default” link_option_url=”https:\/\/lncmi.cnrs.fr\/category\/fermions-lourds” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_button button_url=”https:\/\/lncmi.cnrs.fr\/category\/fermions-lourds\/” button_text=”See all articles” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”16px” locked=”off” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Th\u00e8mes de recherche” module_id=”themes” _builder_version=”4.26.0″ _module_preset=”default” background_color=”rgba(0,0,0,0.02)” global_colors_info=”{}”][et_pb_row column_structure=”1_4,1_4,1_4,1_4″ _builder_version=”4.25.2″ _module_preset=”default” module_alignment=”center” global_colors_info=”{}”][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Topics<\/h3>\n
[\/et_pb_text][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Unconventional_superconductivity-1024×803.jpg” title_text=”Unconventional_superconductivity” _builder_version=”4.27.4″ _module_preset=”default” width=”340px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Unconventional superconductivity<\/p>\n
[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Quantum_Critical_Points-1024×740.jpg” title_text=”Quantum_Critical_Points” _builder_version=”4.27.4″ _module_preset=”default” width=”315px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” max_width=”340px” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” custom_padding=”|0px||||” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Quantum Critical Points<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_4,1_4,1_4,1_4″ _builder_version=”4.25.2″ _module_preset=”default” module_alignment=”center” global_colors_info=”{}”][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Magnetic_Phase_Diagrams-1024×792.jpg” title_text=”Magnetic_Phase_Diagrams” _builder_version=”4.27.4″ _module_preset=”default” width=”340px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Magnetic Phase Diagrams<\/p>\n
[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2025\/06\/Quantum_oscillations_Fermi_surfacespng-1024×844.png” title_text=”Quantum_oscillations_Fermi_surfacespng” _builder_version=”4.27.4″ _module_preset=”default” width=”315px” width_tablet=”150%” width_phone=”150%” width_last_edited=”on|tablet” max_width=”340px” height=”300px” height_tablet=”150px” height_phone=”150px” height_last_edited=”on|desktop” custom_padding=”|0px||||” global_colors_info=”{}” max_width__hover_enabled=”off|desktop” max_height__hover_enabled=”off|desktop”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_4″ _builder_version=”4.25.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Quantum oscillations and Fermi surfaces<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”techniques” module_id=”techniques” _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.2″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Techniques<\/h3>\n
[\/et_pb_text][et_pb_toggle title=”Magnetization” _builder_version=”4.27.4″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n
\n\n\n\n\n\nContac
ts: GABRIEL SEYFARTH (Grenoble) : gabriel.seyfarth \u00a0[a] lncmi.cnrs.fr<\/span><\/h4>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n\n\n\n<\/p>\n<\/p>\n
Magnetization measurement is based on the principle of the Faraday balance, depicted above. A magnetic sample is placed on a suspended platform, inside a magnetic field gradient created by a ferromagnet. The magnetic force on the sample induces a displacement of the platform which is detected with a capacitance measurement.<\/p>\n
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\n\n\n\n\nAbove we show an example of magnetization measurement in high magnetic field and low temperature in a Weyl semimetal. de Haas van Alphen quantum oscillations are measured up to the highest field when applied along the a-axis of the hexagonal structure.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<\/div>\n<\/div>\n<\/div>\n[\/et_pb_toggle][et_pb_toggle title=” Specific Heat” _builder_version=”4.27.4″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n
\n\n\n\n\n\nContact: ALBIN DE MUER albin.demuer\u00a0[a]\u00a0<\/span>lncmi.cnrs.fr (GRENOBLE)<\/h4>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n\n\n\n\n<\/p>\nThe specific heat measurement requires to detect a change in sample temperature upon heating it.<\/p>\n
The sample is glued on a resistive chip used as a sample holder, a thermometer and a heater. Wires with specific material, length and diameter are chosen to hang the setup, to measure the chip resistance and to provide the suitable thermal conductance depending the heat capacity of the sample. Extremities of wires are thermally connected to a thermal bath stabilized in temperature owing to a reference temperature and magnetic field calibrated thermometer.<\/p>\n
A square shape current signal is injected in the chip and the large induced temperature relaxations, as large as 100% of the bath temperature, are measured with accuracy and a high sample rate (around 1000 points over a time range from 1 to 100 s).<\/p>\n
Specific heat is then computed on the whole temperature range relaxation, providing an accurate and fast measurement suitable for high magnetic field measurement.<\/p>\n
Ideal dimensions for the sample consist of thin platelets (few hundred \u00b5m) with an area close to mm\u00b2. Good internal thermal conductivity is required for quality of the measurement. Field orientation may be chosen, in-plane or perpendicular the platelet.<\/p>\n<\/div>\n<\/div>\n<\/div>\n
\n\n\n<\/p>\nAbove we show specific heat measurements in the heavy fermion compound CePt2In7.\u00a0 At the magnetic transition an anomaly is observed in the specific heat (left). This anomaly is tracked up to high magnetic fields in order to construct the phase diagram of this material (right). Check here<\/a> for more info on theses results.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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