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
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

Access to Document

10.1016/j.physc.2009.10.156

Cite this

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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",

month = dec,

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

language = "English",

volume = "470",

pages = "S347--S348",

journal = "Physica C: Superconductivity and its Applications",

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publisher = "Elsevier",

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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

Y1 - 2010/12

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.

KW - High pressure

KW - LaFeAsOF

KW - NMR

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