75As-nuclear magnetic relaxation on LaFeAsO1-xF x under pressure

N. Fujiwara; K. Tatsumi; T. Nakano; H. Okada; H. Takahashi; Y. Kamihara; M. Hirano; H. Hosono

doi:10.1016/j.physc.2009.10.156

⁷⁵As-nuclear magnetic relaxation on LaFeAsO_1-xF _x under pressure

N. Fujiwara, K. Tatsumi, T. Nakano, H. Okada, H. Takahashi, Y. Kamihara, M. Hirano, H. Hosono

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

Abstract

⁷⁵As-nuclear magnetic relaxation rate (1/T₁) was measured under pressure in LaFeAsO_1-xF_x (x = 0.08 and 0.14). For the x = 0.14 doped samples, 1/T₁T = constant is observed at ambient pressure just above T_c, and application of pressure enhances the value, similar to the behavior of T_c. 1/T₁T = constant originates from the Korringa relation, and an increase in DOS due to pressure application leads to the enhancement of T_c. In the case of x = 0.08, 1/T₁T = constant is observed in a wide T range above T _c, and the value is enhanced compared to the case of x = 0.14. The enhancement is attributable to antiferromagnetic spin fluctuation rather than an increase in DOS.

Original language	English
Pages (from-to)	S347-S348
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.10.156
Publication status	Published - 2010 Dec 1
Externally published	Yes

Keywords

High pressure
LaFeAsOF
NMR

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "75As-nuclear magnetic relaxation on LaFeAsO1-xF x under pressure",

abstract = "75As-nuclear magnetic relaxation rate (1/T1) was measured under pressure in LaFeAsO1-xFx (x = 0.08 and 0.14). For the x = 0.14 doped samples, 1/T1T = constant is observed at ambient pressure just above Tc, and application of pressure enhances the value, similar to the behavior of Tc. 1/T1T = constant originates from the Korringa relation, and an increase in DOS due to pressure application leads to the enhancement of Tc. In the case of x = 0.08, 1/T1T = constant is observed in a wide T range above T c, and the value is enhanced compared to the case of x = 0.14. The enhancement is attributable to antiferromagnetic spin fluctuation rather than an increase in DOS.",

keywords = "High pressure, LaFeAsOF, NMR",

author = "N. Fujiwara and K. Tatsumi and T. Nakano and H. Okada and H. Takahashi and Y. Kamihara and M. Hirano and H. Hosono",

year = "2010",

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doi = "10.1016/j.physc.2009.10.156",

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TY - JOUR

T1 - 75As-nuclear magnetic relaxation on LaFeAsO1-xF x under pressure

AU - Fujiwara, N.

AU - Tatsumi, K.

AU - Nakano, T.

AU - Okada, H.

AU - Takahashi, H.

AU - Kamihara, Y.

AU - Hirano, M.

AU - Hosono, H.

PY - 2010/12/1

Y1 - 2010/12/1

N2 - 75As-nuclear magnetic relaxation rate (1/T1) was measured under pressure in LaFeAsO1-xFx (x = 0.08 and 0.14). For the x = 0.14 doped samples, 1/T1T = constant is observed at ambient pressure just above Tc, and application of pressure enhances the value, similar to the behavior of Tc. 1/T1T = constant originates from the Korringa relation, and an increase in DOS due to pressure application leads to the enhancement of Tc. In the case of x = 0.08, 1/T1T = constant is observed in a wide T range above T c, and the value is enhanced compared to the case of x = 0.14. The enhancement is attributable to antiferromagnetic spin fluctuation rather than an increase in DOS.

AB - 75As-nuclear magnetic relaxation rate (1/T1) was measured under pressure in LaFeAsO1-xFx (x = 0.08 and 0.14). For the x = 0.14 doped samples, 1/T1T = constant is observed at ambient pressure just above Tc, and application of pressure enhances the value, similar to the behavior of Tc. 1/T1T = constant originates from the Korringa relation, and an increase in DOS due to pressure application leads to the enhancement of Tc. In the case of x = 0.08, 1/T1T = constant is observed in a wide T range above T c, and the value is enhanced compared to the case of x = 0.14. The enhancement is attributable to antiferromagnetic spin fluctuation rather than an increase in DOS.

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KW - LaFeAsOF

KW - NMR

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