Multiple gaps in SmFeAsO0.9F0.1 revealed by point-contact spectroscopy

被引：73
|
作者：
Wang, Yong-Lei [1 ]
Shan, Lei
Fang, Lei
Cheng, Peng
Ren, Cong
Wen, Hai-Hu
机构：
[1] Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, Natl Lab Superconduct, Beijing 100190, Peoples R China
来源：
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2009年 / 22卷 / 01期
关键词：
LAYERED SUPERCONDUCTOR; TRANSITION; MODEL;
D O I：
10.1088/0953-2048/22/1/015018
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report the observation of two gaps in the superconductor SmFeAsO0.9F0.1 (F-SmFeAsO) with T-c = 51.5 K as measured by point-contact spectroscopy. Both gaps decrease with temperature and vanish at Tc, and the temperature dependence of the gaps is described by the theoretical prediction of the Bardeen-Cooper-Schrieffer (BCS) theory. A zero-bias conductance peak (ZBCP) was observed, indicating the presence of sign reversal of the gap function in F-SmFeAsO. Our results strongly suggest an unconventional superconductivity with multiple gaps in F-SmFeAsO.
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页数：6
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