期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 77, 期 10, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.103704
关键词
Fe pnictites; superconductivity; NMR; Knight shift; impurity effect
资金
- Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports. Science and Technology
We have prepared the superconducting system LaFe1-yCoyAsO1-xFx (x=0.11) and carried out measurements of their electrical resistivity p and superconducting diamagnetism. As-75- and La-135-NMR studies have also been carried out. The Knight shift observed for As-75 has been found to be suppressed by the superconductivity; for La-135, the shift is almost insensitive to the superconductivity. This result presents rather strong experimental evidence for singlet pairing. The Co doping effect on the superconducting transition temperature T-c is not so significant as expected for superconductors with nodes, suggesting that the potential scattering does not seem to primarily suppress the superconductivity. Even for superconductors without nodes, it may not be so trivial to expect this small effect, if there are two different (disconnected) Fermi surfaces whose order parameters have opposite signs. As a possible explanation of the observed T-c suppression, which is found to be small, seems to be related with the loss of the itinerant nature of the electrons.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据