2012/07/31 by Hidekazu Mukuda, H. Mukuda, Satoshi Furukawa +11 · 1 citation
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Antiferromagnetism #Computer science #Condensed matter physics #Corporate Taxation and Avoidance #Fermi liquid theory #Fermi surface #Iron-based superconductors research #Machine learning #Physics #Rare-earth and actinide compounds #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.109.157001
published as Phys. Rev. Lett. 109, 157001,(2012) · 4 pages, 3 figures, accepted for publication in Phys Rev. Lett
arxiv created 2012/08/28 · openalex publication_date 2012/10/09 · arxiv updated 2014/03/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report on an 75As-NMR study on the Fe-pnictide high-Tc superconductor Y0.95La0.05FeAsO_1\ensuremath-y (Y0.95La0.051111) with Tc=50 K that includes no magnetic rare-earth elements. The measurement of the nuclear-spin lattice-relaxation rate 75(1/T1) has revealed that the nodeless bulk superconductivity takes place at Tc=50 K while antiferromagnetic spin fluctuations develop moderately in the normal state. These features are consistently described by the multiple fully gapped s_\ifmmode±\else\textpm\fi-wave model based on the Fermi-surface nesting. Incorporating the theory based on band calculations, we propose that the reason that Tc=50 K in Y0.95La0.051111 is larger than Tc=28 K in La1111 is that the Fermi-surface multiplicity is maximized, and hence the Fermi-surface nesting condition is better than that in La1111.