Evidence for collective pinning in high-temperature superconductors

Y. Y. Xue; Z. J. Huang; P. H. Hor; C. W. Chu

doi:10.1103/PhysRevB.43.13598

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Evidence for collective pinning in high-temperature superconductors

Y. Y. Xue, Z. J. Huang, P. H. Hor, C. W. Chu

DOI 10.1103/PhysRevB.43.13598 · Physical Review B

T1

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Abstract

The relaxation behavior of the remnant moments of two thin-wall rings, one closed and the other open, and powders of various sizes of melt-textured YBa2Cu3O7 has been investigated. The activation energies (U0’s) obtained are the same at all temperatures in all cases, directly demonstrating that the relaxation in a high-temperature superconductor (HTS) cannot be explained in terms of a distribution of U0’s associated with different domains as previously suggested. A temperature-dependent pinning volume of flux bundles is necessary to account for the experimental results. A scaling relationship, U0∝[1-(T/Tc)2]m/(BJ2)k, is therefore proposed for such a collective pinning to explain the macroscopic properties of HTS’s.

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.	—	Pressure not reported	unknown