Nonmonotonic temperature dependence of the experimentally determined vortex-creep activation energy in disordered high-temperature superconductors
L. Miu, S. Popa, T. Noji, Y. Koike, D. Miu, S. Diaz, G. Chouteau
DOI 10.1103/PhysRevB.70.134523 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The temperature T variation of the normalized vortex-creep activation energy U* determined in standard magnetization relaxation experiments for Pb2Sr2Y0.53Ca0.47Cu3O8+δ single crystals with random point disorder exhibits a maximum, which moves to lower-T values by increasing the external magnetic field oriented parallel to the c axis. The nonmonotonic U*(T) dependence is related to the change of the vortex pinning barriers involved in the creep process across the order-disorder transition in the vortex system (accompanied by the occurrence of the second magnetization peak), in a dynamic scenario. The decrease of U* with decreasing T in the low-T region is caused by the shift of the current density J range probed in standard magnetization measurements toward the critical current density, and the significant U*(J) variation in the elastic-creep domain. The dynamic approach is confirmed by the behavior of highly disordered top-seeded melt-grown YBa2Cu3O7−δ crystals at low T, for which no second magnetization peak appears, and U* does not depend on T.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb2Sr2Y0.53Ca0.47Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 76 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
Similar papers
Accommodation of vortices to tilted line defects in high-Tc superconductors with various electronic anisotropies
similarity 0.97V. Hardy et al.
Source status unknown — claims are unverified
Critical fluctuations and pinning effects on the vortex transport in superconducting Y-Ba-Cu-O single crystals
similarity 0.97N.-C. Yeh et al.
Source status unknown — claims are unverified
Effect of deoxygenation on the vortex dynamics in RBa2Cu3O7−δ high-temperature superconductors
similarity 0.97G. K. Perkins et al.
Source status unknown — claims are unverified
High-field scaling behavior of thermodynamic and transport quantities of YBa2Cu3O7−δ near the superconducting transition
similarity 0.96U. Welp et al.
Source status unknown — claims are unverified
Superconductivity fluctuations in electrical and thermoelectrical properties of granular ceramic superconductors: Homogeneous versus fractal behavior
similarity 0.96P. Clippe et al.
Source status unknown — claims are unverified
Temperature dependence of the upper critical field of type-II superconductors from isothermal magnetization data: Application to high-temperature superconductors
similarity 0.96I. L. Landau & H. R. Ott
Source status unknown — claims are unverified