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 shows certain unique features that have an interesting evolution with increasing temperature up to a temperature far above the critical temperature . We associate this observation with the existence of a gap above that might originate from strong fluctuations of the phase of the superconducting order parameter.
Conductance asymmetry in point-contacts on epitaxial thin films of
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; Conductance asymmetry in point-contacts on epitaxial thin films of . Appl. Phys. Lett. 5 July 2010; 97 (1): 012503. https://doi.org/10.1063/1.3460274
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