Spatially heterogeneous character of superconductivity in MgB2 as revealed by local probe and bulk measurements

T. Ekino, A. M. Gabovich, Mai Suan Li, T. Takasaki, A. I. Voitenko, J. Akimitsu, H. Fujii, T. Muranaka, M. Pekala, H. Szymczak

Research output: Contribution to journalConference article

11 Citations (Scopus)

Abstract

Controversial tunnel and point-contact experimental data on superconducting gap values in MgB2 are analyzed and interpreted in terms of the spatial inhomogeneity and the proximity effect appropriate to this layered compound. Existing specific heat measurements are explained in the same way. Break-junction tunnel studies of polycrystalline MgB2 samples are carried out and a clear-cut multiplicity of gaps is observed, although the shapes of the I-V characteristics vary substantially.

Original languageEnglish
Pages (from-to)230-233
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume426-431
Issue numberI
DOIs
Publication statusPublished - Oct 1 2005
EventProceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity -
Duration: Nov 23 2004Nov 25 2004

Keywords

  • Break junction
  • Heat capacity
  • MgB
  • Tunnel spectra

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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