Negative dynamic creep in the peak-effect regime in type-II superconductors
A. A. Zhukov, S. Kokkaliaris, P. A. J. de Groot, M. J. Higgins, S. Bhattacharya, R. Gagnon, L. Taillefer
DOI 10.1103/PhysRevB.61.R886 · Physical Review B
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Abstract
We report the observation of a negative dynamic creep rate, i.e., increasing irreversibility in the magnetic hysteresis loop for decreasing sweep rate of the magnetic field, in both YBa2Cu3O7−δ and 2H−NbSe2 single crystals. This phenomenon is found to appear on the increasing branch of the peak effect that corresponds to a state which is intermediate between the dislocation-free Bragg glass and a highly disordered vortex phase. The origin of this anomalous creep is shown to be connected to a negative differential resistance resulting from the N-like shape of the current-voltage characteristics.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.7 | Pressure not reported | onset |
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