Origin of the plateau in the temperature dependence of the normalized magnetization relaxation rate in disordered high-temperature superconductors
L. Miu, D. Miu, T. Petrisor, A. El Tahan, G. Jakob, H. Adrian
DOI 10.1103/PhysRevB.78.212508 · Physical Review B
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Abstract
The temperature T dependence of the normalized magnetization relaxation rate S in optimally doped YBa2Cu3O7−δ films with the external dc magnetic field H oriented along the c axis exhibits the well-known plateau in the intermediate T range, associated with the presence of elastic (collective) vortex creep. The disappearance of the S(T) plateau in the high-H domain (H≥20 kOe) is not completely understood. We show that in the case of high-temperature superconductors with significant quenched disorder the S(T) plateau is directly related to a crossover in the vortex-creep process generated by the macroscopic currents induced in the sample. In dc magnetization measurements the creep-crossover temperature decreases rapidly with increasing H, reaching the low-T region where the magnetization decay is dominated by micro flux jumps. Consequently, at high H no well-defined elastic-creep domain is present and the S(T) plateau disappears.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.5 | Pressure not reported | onset |
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