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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