Microtorquemeter for magnetization measurements on small superconducting samples
- 1 December 1992
- journal article
- conference paper
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 63 (12) , 5726-5732
- https://doi.org/10.1063/1.1143355
Abstract
A torquemeter with a noise level of ∼10−12 N m was developed and used for magnetization measurements (due to the Meissner–Ochsenfeld effect) on superconducting samples with a mass typically smaller than 10μg. The torquemeter consists of a very soft, thin metal beam, symmetrically placed between two capacitor plates, which are used for position measurement. Due to the symmetric setup electrostatic forces on the beam are largely compensated. A cheap but accurate electronic device replaces the conventional capacitance bridge and lock‐in amplifier. Calibration of this kind of apparatus is discussed in some detail. Experiments are reported on a 6 μg lead disk and on small crystals of YBa2Cu3O7 and Nd2−xCexCuO4−δ.Keywords
This publication has 19 references indexed in Scilit:
- Lock-in transition of flux-lines in layered superconductorsPhysica C: Superconductivity and its Applications, 1991
- Fast neutron irradiation effects on magnetization relaxation in YBCO single crystalsPhysica C: Superconductivity and its Applications, 1991
- Thermally activated flux-motion and quantum tunneling of vortices in high-Tc superconductorsPhysica C: Superconductivity and its Applications, 1991
- Contributions of pinning and anisotropy to torque in YBaCuOPhysica C: Superconductivity and its Applications, 1990
- Flux creep and critical currents in epitaxial high Tc filmsCryogenics, 1990
- Torque in the irreversible regime on oriented crystalsPhysical Review B, 1989
- Critical currents and magnetic relaxation of epitaxial YBa2Cu3O7 − δ filmsJournal of the Less Common Metals, 1989
- Magnetic torque investigation of YBaCuO single crystalsPhysica C: Superconductivity and its Applications, 1988
- Homogeneous strain response of the Fermi surface of molybdenumPhysical Review B, 1977
- A capacitance torquemeter for de Haas-van Alphen measurementsCryogenics, 1973