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Evidence for vortex pinning induced by fluctuations in the transition temperature of MgB2 superconductors

Journal Article


Abstract


  • The field-dependent critical current density jc(B) of a MgB2 bulk sample has been obtained using magnetic measurements. The jc(B) curves at different temperatures demonstrate a crossover from single vortex pinning to small-bundle vortex pinning, when the field is larger than the crossover field Bsb. The temperature dependence of Bsb(T) is in agreement with a model of randomly distributed weak pinning centers via the spatial fluctuations of the transition temperature (δTc pinning), while pinning due to the mean-free-path fluctuations (δl pinning) is not observed.

Publication Date


  • 2002

Citation


  • Qin, M. J., Wang, X. L., Liu, H. K., & Dou, S. X. (2002). Evidence for vortex pinning induced by fluctuations in the transition temperature of MgB2 superconductors. Physical Review B - Condensed Matter and Materials Physics, 65(13), 1325081-1325084.

Scopus Eid


  • 2-s2.0-0036538574

Web Of Science Accession Number


Start Page


  • 1325081

End Page


  • 1325084

Volume


  • 65

Issue


  • 13

Abstract


  • The field-dependent critical current density jc(B) of a MgB2 bulk sample has been obtained using magnetic measurements. The jc(B) curves at different temperatures demonstrate a crossover from single vortex pinning to small-bundle vortex pinning, when the field is larger than the crossover field Bsb. The temperature dependence of Bsb(T) is in agreement with a model of randomly distributed weak pinning centers via the spatial fluctuations of the transition temperature (δTc pinning), while pinning due to the mean-free-path fluctuations (δl pinning) is not observed.

Publication Date


  • 2002

Citation


  • Qin, M. J., Wang, X. L., Liu, H. K., & Dou, S. X. (2002). Evidence for vortex pinning induced by fluctuations in the transition temperature of MgB2 superconductors. Physical Review B - Condensed Matter and Materials Physics, 65(13), 1325081-1325084.

Scopus Eid


  • 2-s2.0-0036538574

Web Of Science Accession Number


Start Page


  • 1325081

End Page


  • 1325084

Volume


  • 65

Issue


  • 13