Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3460274
Keywords
arsenic alloys; barium alloys; cobalt alloys; electrical conductivity; fluctuations in superconductors; heavy fermion superconductors; iron alloys; point contact spectroscopy; point contacts; silver; superconducting energy gap; superconducting epitaxial layers; superconducting transition temperature
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Funding
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-FG02-06ER46346, DE-FG02-06ER46327]
- NSF [DMR-0084173]
- State of Florida
- AFOSR [FA9550-06-1-0474]
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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(Fe0.92Co0.08)(2)As-2 shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature T-c. We associate this observation with the existence of a gap above T-c that might originate from strong fluctuations of the phase of the superconducting order parameter. (C) 2010 American Institute of Physics. [doi:10.1063/1.3460274]
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