{"id":9249,"date":"2021-02-02T15:27:00","date_gmt":"2021-02-02T13:27:00","guid":{"rendered":"https:\/\/lncmi.cnrs.fr\/?p=9249"},"modified":"2025-07-07T14:15:08","modified_gmt":"2025-07-07T12:15:08","slug":"robust-fermi-surface-at-a-quantum-critical-point","status":"publish","type":"post","link":"https:\/\/lncmi.cnrs.fr\/en\/news\/robust-fermi-surface-at-a-quantum-critical-point\/","title":{"rendered":"Robust Fermi surface at a quantum critical point"},"content":{"rendered":"\n<p>A quantum critical point is a second-order phase transition occurring at zero temperature. Around a quantum critical point, quantum fluctuations affect the electronic properties of a solid and give rise to new exciting phenomena. In the prototypical heavy-fermion system CeRhIn<sub>5<\/sub>, a magnetic field can be used to drive the system to a quantum critical point. The exact nature and origin of this quantum critical point remains to be understood.<\/p>\n\n\n\n<p>Researchers from LNCMI Grenoble, HLD Dresden and HMFL Nijmegen, together with their Japanese colleagues, performed a comprehensive high-field Fermi-surface study of CeRhIn<sub>5<\/sub>. They established the localized character of the <em>f<\/em> electrons in CeRhIn<sub>5<\/sub> both inside and outside of the antiferromagnetic phase. Their results rule out any field-induced Fermi-surface reconstruction, either at the suggested electronic-nematic transition at <em>B<\/em>* = 30 T or at the field-induced quantum critical point at <em>B<\/em><sub>c<\/sub> \u2248 50 T. This study suggests that the field-induced quantum criticality in CeRhIn<sub>5<\/sub> does not conform with the established theoretical models of an antiferromagnetic quantum critical point.<\/p>\n\n\n\n<p><strong>Publication<\/strong>&#8211; Robust Fermi-Surface Morphology of CeRhIn<sub>5<\/sub> across the Putative Field-Induced Quantum Critical Point &#8211; S. Mishra, J. Hornung, M. Raba, J. Klotz, T. F\u00f6rster, H. Harima, D. Aoki, J. Wosnitza, A. McCollam, and I. Sheikin, <a href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.126.016403\">Phys. Rev. Lett. <strong>126, <\/strong>016403 (2021)<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"448\" src=\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2021\/02\/TorquevsB-1536x672-1-1024x448.png\" alt=\"\" class=\"wp-image-23387\" srcset=\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2021\/02\/TorquevsB-1536x672-1-980x429.png 980w, https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2021\/02\/TorquevsB-1536x672-1-480x210.png 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/figure>\n\n\n\n<p><strong>Figure<\/strong> &#8211; Magnetic torque (dHvA) oscillations in CeRhIn<sub>5 <\/sub>through the transition at B* and the field-induced quantum critical point at B<sub>c<\/sub>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A quantum critical point is a second-order phase transition occurring at zero temperature. Around a quantum critical point, quantum fluctuations affect the electronic properties of a solid and give rise [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":23387,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[292],"tags":[],"post_folder":[],"class_list":["post-9249","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"jetpack_featured_media_url":"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2021\/02\/TorquevsB-1536x672-1.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/9249","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/comments?post=9249"}],"version-history":[{"count":0,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/9249\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media\/23387"}],"wp:attachment":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media?parent=9249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/categories?post=9249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/tags?post=9249"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/post_folder?post=9249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}