Fast spin fluctuation viewed by muon spin relaxation in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO1-xF x

Kazuki Ohishi; Yasuyuki Ishii; Kiichi Miyazawa; Hideto Fukazawa; Isao Watanabe; Yoh Kohori; Parasharam M. Shirage; Hijiri Kito; Akira Iyo; Hiroshi Eisaki

doi:10.1143/JPSJ.80.024703

Fast spin fluctuation viewed by muon spin relaxation in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO_1-xF _x

Kazuki Ohishi, Yasuyuki Ishii, Kiichi Miyazawa, Hideto Fukazawa, Isao Watanabe, Yoh Kohori, Parasharam M. Shirage, Hijiri Kito, Akira Iyo, Hiroshi Eisaki

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Zero-field and longitudinal-field muon spin relaxation (μSR) measurements have been performed in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO_1-xF_x 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 μSR and their fluctuation frequency is beyond the upper limit of the characteristic time window of μSR (∼10^-11 s) in optimally doped and overdoped LaFeAsO _1-xF_x.

Original language	English
Article number	024703
Journal	journal of the physical society of japan
Volume	80
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.80.024703
Publication status	Published - 2011 Feb
Externally published	Yes

Keywords

Iron-based oxypnictide
LaFeAsO F
Normal state
Superconductivity
μSR

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.80.024703

Cite this

Ohishi, K., Ishii, Y., Miyazawa, K., Fukazawa, H., Watanabe, I., Kohori, Y., Shirage, P. M., Kito, H., Iyo, A., & Eisaki, H. (2011). Fast spin fluctuation viewed by muon spin relaxation in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO_1-xF _x. journal of the physical society of japan, 80(2), [024703]. https://doi.org/10.1143/JPSJ.80.024703

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title = "Fast spin fluctuation viewed by muon spin relaxation in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO1-xF x",

abstract = "Zero-field and longitudinal-field muon spin relaxation (μSR) 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 μSR and their fluctuation frequency is beyond the upper limit of the characteristic time window of μSR (∼10-11 s) in optimally doped and overdoped LaFeAsO 1-xFx.",

keywords = "Iron-based oxypnictide, LaFeAsO F, Normal state, Superconductivity, μSR",

author = "Kazuki Ohishi and Yasuyuki Ishii and Kiichi Miyazawa and Hideto Fukazawa and Isao Watanabe and Yoh Kohori and Shirage, {Parasharam M.} and Hijiri Kito and Akira Iyo and Hiroshi Eisaki",

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doi = "10.1143/JPSJ.80.024703",

language = "English",

volume = "80",

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T1 - Fast spin fluctuation viewed by muon spin relaxation in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO1-xF x

AU - Ohishi, Kazuki

AU - Ishii, Yasuyuki

AU - Miyazawa, Kiichi

AU - Fukazawa, Hideto

AU - Watanabe, Isao

AU - Kohori, Yoh

AU - Shirage, Parasharam M.

AU - Kito, Hijiri

AU - Iyo, Akira

AU - Eisaki, Hiroshi

PY - 2011/2

Y1 - 2011/2

N2 - Zero-field and longitudinal-field muon spin relaxation (μSR) 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 μSR and their fluctuation frequency is beyond the upper limit of the characteristic time window of μSR (∼10-11 s) in optimally doped and overdoped LaFeAsO 1-xFx.

AB - Zero-field and longitudinal-field muon spin relaxation (μSR) 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 μSR and their fluctuation frequency is beyond the upper limit of the characteristic time window of μSR (∼10-11 s) in optimally doped and overdoped LaFeAsO 1-xFx.

KW - Iron-based oxypnictide

KW - LaFeAsO F

KW - Normal state

KW - Superconductivity

KW - μSR

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