期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 78, 期 12, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.123709
关键词
iron pnictide; superconductor; NMR; spin fluctuations; pressure effect; FeSe0.5Te0.5
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Japan Society for the Promotion of Science [19014007]
- [19340097]
- Grants-in-Aid for Scientific Research [19014007] Funding Source: KAKEN
To investigate the relationship between Superconductivity and low-energy spin fluctuations in the iron-based superconductor FeSe0.5Te0.5, we have conducted Te-125 NMR measurements at ambient pressure and 2GPa. As the superconducting transition temperature T-c is increased by applying pressure, the nuclear spin-lattice relaxation rate divided by temperature, 1/T1T, shows the development of antiferromagnetic fluctuations upon lowering temperature toward T-c. This supports the scenario that spill fluctuations promote superconducting pairing. The depressed Knight shift K-125 and the absence of a coherence peak in 1/T-1, below T-c are consistent with spin-singlet superconducting pairing with an anisotropic order parameter. In the normal metallic state, the comparison between the uniform and dynamic spin Susceptibilities Suggests the existence of a Fermi level located near the singularity of the band structure.
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