Rotational magnetic processes in a dirty superconductor
Liwen Liu, J. S. Kouvel, T. O. Brun
DOI 10.1103/PhysRevB.38.11799 · Physical Review B
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Abstract
Magnetization-vector (M) measurements were made on a thin disk of impure Nb rotated relative to a fixed field H at 4.2 K. For all H, M is found to be separable into a nonrotating diamagnetic component Md plus a penetrating-flux component Mp that turns rigidly with the sample for small rotation angles. For H below Hc1 on a hysteresis loop, Mp diminishes in size but continues to rotate rigidly up to 360°. For H between Hc1 and Hc2, Mp rotates up to and then remains at some critical angle, indicating a constant frictional torque between Mp and the sample, which presumably arises from vortex-flux jumps between pinning centers. Moreover, Md closely equals −H4π for H above as well as below Hc1.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.4 | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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