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Non-magnetic pair-breaking effect on La(Fe_{1-x}Zn_{x})AsO_{0.85} studied by NMR and NQR

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arxiv 1104.0724 v2 pith:332V4LCB submitted 2011-04-05 cond-mat.supr-con cond-mat.str-el

S. Kitagawa , Y. Nakai , T. Iye , K. Ishida , Y. F. Guo , Y. G. Shi , K. Yamaura , E. Takayama-Muromachi This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords substitutionsuperconductivityeffectlafeasonon-magneticpair-breakingalthoughbeen
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abstract

$^{75}$As and $^{139}$La NMR and nuclear quadrupole resonance (NQR) studies on Zn-substituted LaFeAsO$_{0.85}$ have been performed to investigate the Zn-impurity effects microscopically. Although superconductivity in LaFeAsO$_{0.85}$ disappears by 3% Zn substitution, we found that NMR/NQR spectra and NMR physical quantities in the normal state are hardly changed, indicating that the crystal structure and electronic states are not modified by Zn substitution. Our results suggest that the suppression of superconductivity by Zn substitution is not due to the change of the normal-state properties, but due to strong non-magnetic pair-breaking effect to superconductivity.

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