期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 80, 期 2, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.024703
关键词
superconductivity; normal state; iron-based oxypnictide; LaFeAsO1-xFx; mu SR
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Grants-in-Aid for Scientific Research [21540351] Funding Source: KAKEN
Zero-field and longitudinal-field muon spin relaxation (mu SR) measurements have been performed in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO1-xFx in order to investigate the spin dynamics over a wide temperature range. We have observed no sign of the slowing-down behavior of the spin fluctuations in all samples below and above the superconducting transition temperature. The results of the present study suggest that spins, which would play an important role in the appearance of superconductivity with the characteristics of the Fermi surface, fluctuate rapidly from the viewpoint of mu SR and their fluctuation frequency is beyond the upper limit of the characteristic time window of mu SR (similar to 10(-11) s) in optimally doped and overdoped LaFeAsO1-xFx.
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