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Type: Artigo de periódico
Title: Local And Global Superconductivity In Bismuth
Author: Baring L.A.
da Silva R.R.
Kopelevich Y.
Abstract: We performed magnetization M(H, T) and magnetoresistance R(T, H) measurements on powdered (grain size ~149 μm) as well as highly oriented rhombohedral (A7) bismuth (Bi) samples consisting of single crystalline blocks of size ~1 x 1 mm in the plane perpendicular to the trigonal c axis. The obtained results revealed the occurrence of (1) local superconductivity in powdered samples with T c(0) ± (8.75 ± 0.05) K, and (2) global superconductivity at T c(0) ± (7.3 ± 0.1) K in polycrystalline Bi triggered by low-resistance ohmic contacts with silver (Ag) normal metal. The results provide evidence that the superconductivity in Bi is localized in a tiny volume fraction, probably at intergrain or Ag/Bi interfaces. On the other hand, the occurrence of global superconductivity observed for polycrystalline Bi can be accounted for by enhancement of the superconducting order parameter phase stiffness induced by the normal metal contacts, the scenario proposed in the context of pseudogap regime in cuprates [E. Berg et al. , Phys. Rev. B 78, 094509 (2008)]. © 2011 American Institute of Physics.
Rights: aberto
Identifier DOI: 10.1063/1.3671591
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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