Fast Spin Fluctuation Viewed by Muon Spin Relaxation in Optimally Doped and Overdoped Iron-Based Oxypnictide Superconductors LaFeAsO1-xFx
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概要
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Zero-field and longitudinal-field muon spin relaxation (\muSR) 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 \muSR and their fluctuation frequency is beyond the upper limit of the characteristic time window of \muSR ({\sim}10^{-11} s) in optimally doped and overdoped LaFeAsO1-xFx.
- 2011-02-15
著者
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MIYAZAWA Kiichi
National Institute of Advanced Industrial Science and Technology
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SHIRAGE Parasharam
National Institute of Advanced Industrial Science and Technology
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EISAKI Hiroshi
National Institute of Advanced Industrial Science and Technology
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Kito Hijiri
National Inst. Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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Iyo Akira
National Inst. Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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Kohori Yoh
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Fukazawa Hideto
Department Of Physics Chiba University
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Watanabe Isao
Advanced Meson Science Laboratory Nishina Center Riken
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Ishii Yasuyuki
Advanced Meson Science Laboratory Riken Nishina Center
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Miyazawa Kiichi
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Ohishi Kazuki
Advanced Meson Science Laboratory, Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
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Kito Hijiri
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Kohori Yoh
Department of Physics, Chiba University, Chiba 263-8522, Japan
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Shirage Parasharam
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Eisaki Hiroshi
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Fukazawa Hideto
Department of Physics, Chiba University, Chiba 263-8522, Japan
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Ishii Yasuyuki
Advanced Meson Science Laboratory, Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan
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