Torque magnetometry is a powerfull technique to measure quantum oscillations in metals. In pulsed field magnetic torque measurement is performed with a commercial piezoresistive micro-cantilever, as shown in the figure above. The size of the sample studied is approximately 0.1×0.1×0.05 mm3. Variations of the cantilever piezoresistance are measured with a Wheatstone bridge with an ac excitation at a frequency of 63kHz. In static field, the bending of a CuBe cantilever is measured capacitively.
As an example we show quantum oscillations signal measured with torque magnetometry in pulsed field in an organic conductor κ-(BEDT-TTF)2Cu(NCS)2 (left) and in a high-Tc cuprate superconductor YBa2Cu3Oy (right).
| Pulsed field | Static field | |
|---|---|---|
| Bmax | 90 T | 36 T |
| Temperature range | 1.5 K - 300 K | 0.05 K - 300 K |