2009/11/19 by Chishiro Michioka, Michioka, Chishiro, Hiroto Ohta +9
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.0911.3729
openalex publication_date 2009/11/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have performed 125Te NMR on a single crystal of the novel layered superconductor Fe1.04Te0.67Se0.33 for the first time. The spin parts of the Knight shifts for both H // a, H // c are suppressed in the superconducting state, indicating the spin singlet superconductivity. At superconducting state, 1/T1 shows the power-law behavior (∼ T3) without any coherent peaks. Observations of the residual density of state and the T3-law indicate the presence of the line node in the superconducting gap. In the normal state, 1/T1T which probes the q-summation of spin fluctuations enhances at low temperatures. Our results suggest that the superconductivity in Fe1+δTe1-xSex is stabilized by the growth of the antiferromagnetic spin fluctuations as well as in FeSe.