Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1868968 | Physics Procedia | 2015 | 4 Pages |
Abstract
The energy gap ofFeSexTe1-x(x = 0.4-0.5) was investigated by break-junctiontunneling spectroscopy. We found two main kinds of the gap. The predominant one is aBardeen-Cooper-Schrieffersuperconducting gap structure with 4Î (4Â K) = 5 - 13 meV, corresponding to the SIS (superconductor-insulator-superconductor) junction, where 2Î stands for the superconducting gap. The observed gap distribution is naturally attributed to local inhomogeneity in the tested crystalpatch. Another gap-likestructure appears as broadened gap peaks of Vp-p(4Â K) â 80Â mV, which is consistent with the local large gapdetected by our scanning-tunneling-spectroscopy measurements using the same crystal batch. The possible origin of the gap is discussed bearing in mind the structural phase transitions occurring in FeSexTe1-x.
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Authors
Toshikazu Ekino, Kouhei Nagasaka, Yuta Sakai, Akira Sugimoto, Alexander M. Gabovich,