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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The temperature T variation of the normalized vortex-creep activation energy U* determined in standard magnetization relaxation experiments for Pb2Sr2Y0.53Ca0.47Cu 3O8+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.

Original languageEnglish
Article number134523
Pages (from-to)134523-1-134523-5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number13
DOIs
Publication statusPublished - 2004 Oct

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Nonmonotonic temperature dependence of the experimentally determined vortex-creep activation energy in disordered high-temperature superconductors'. Together they form a unique fingerprint.

Cite this