Nature of magnetic relaxation in a superconducting Pr1.85Ce0.15CuO4−y single crystal
L. Fábrega, B. Martínez, J. Fontcuberta, S. Piñol
DOI 10.1103/PhysRevB.48.13840 · Physical Review B
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Abstract
Magnetic relaxation in a Pr1.85Ce0.15CuO4−y single crystal has been studied as a function of field and temperature. Two different regimes are evident in the relaxation process. The usual logarithmic decay of the magnetization is observed at low fields. A crossover from logarithmic to exponential relaxation takes place at higher fields. The magnetization decay becomes exponential as H approaches Hirr(T), and eventually any trace of relaxation disappears. The logarithmic decays have been used to estimate the field dependences of the critical currents and the relevant activation energies at high driving currents. The functional dependence U(J) has been evaluated by using Maley’s method. The extracted values for U(J,T,B) are discussed in terms of the available models for flux motion; we conclude that the observed behavior might be a signature of a crossover in the nature of the thermally activated process, from jumps of elastically correlated flux volumes to plastic flux motion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.2 | Pressure not reported | onset |
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