Please use this identifier to cite or link to this item:
|Type:||Artigo de periódico|
|Title:||Local and global superconductivity in bismuth|
da Silva, RR
|Abstract:||We performed magnetization M(H, T) and magnetoresistance R(T, H) measurements on powdered (grain size similar to 149 mu m) as well as highly oriented rhombohedral (A7) bismuth (Bi) samples consisting of single crystalline blocks of size similar to 1 x 1mm 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) (8.7560.05) 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)]. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3671591]|
|Editor:||Amer Inst Physics|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.