High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study

A. Iyo; H. Eisaki; H. Kinouchi; H. Mukuda; M. Yashima; P. M. Shirage; S. Furukawa; Y. Kitaoka

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High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study

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arxiv 1207.1185 v2 pith:KSBZFROF submitted 2012-07-05 cond-mat.supr-con

H. Mukuda , S. Furukawa , H. Kinouchi , M. Yashima , Y. Kitaoka , P. M. Shirage , H. Eisaki , A. Iyo This is my paper

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keywords as-nmrfeasohigh-tcla1111nestingnodelesspm-wavesuperconductivity

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We report 75As-NMR study on the Fe-pnictide high-Tc superconductor Y0.95La0.05FeAsO_{1-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 (AFSFs) develop moderately in the normal state. These features are consistently described by the multiple fully-gapped s_\pm-wave model based on the Fermi-surface (FS) 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 FS multiplicity is maximized, and hence the FS nesting condition is better than that in La1111.

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