Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 78, Issue 12, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.123709
Keywords
iron pnictide; superconductor; NMR; spin fluctuations; pressure effect; FeSe0.5Te0.5
Categories
Funding
- 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
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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.
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