High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study
Autor: | Mukuda, H., Furukawa, S., Kinouchi, H., Yashima, M., Kitaoka, Y., Shirage, P. M., Eisaki, H., Iyo, A. |
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Rok vydání: | 2012 |
Předmět: | |
Zdroj: | Phys. Rev. Lett. 109, 157001,(2012) |
Druh dokumentu: | Working Paper |
DOI: | 10.1103/PhysRevLett.109.157001 |
Popis: | 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. Comment: 4 pages, 3 figures, accepted for publication in Phys Rev. Lett |
Databáze: | arXiv |
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