Conductance asymmetry in point-contacts on epitaxial thin films of Ba (Fe0.92Co0.08)2 As2

Manan Mehta*, Goutam Sheet, D. A. Dikin, S. Lee, C. W. Bark, J. Jiang, J. D. Weiss, E. E. Hellstrom, M. S. Rzchowski, C. B. Eom, V. Chandrasekhar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

One of the most common observations in point-contact spectra on the recently discovered ferropnictide superconductors is a large conductance asymmetry with respect to voltage across the point-contact. In this paper, we show that the antisymmetric part of the point-contact spectrum between a silver tip and an epitaxial thin film of Ba (Fe0.92 Co0.08)2 As2 shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature Tc. We associate this observation with the existence of a gap above Tc that might originate from strong fluctuations of the phase of the superconducting order parameter.

Original languageEnglish (US)
Article number012503
JournalApplied Physics Letters
Volume97
Issue number1
DOIs
StatePublished - Jul 5 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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