NMR measurements of intrinsic spin susceptibility in LaFeAsO 0.9F0.1

Takashi Imai; Kanagasingham Ahilan; Fanlong Ning; Michael A. McGuire; Athena S. Sefat; Ronying Jin; Brian C. Sales; David Mandrus

doi:10.1143/JPSJS.77SC.47

NMR measurements of intrinsic spin susceptibility in LaFeAsO _0.9F_0.1

Takashi Imai
, Kanagasingham Ahilan
, Fanlong Ning
, Michael A. McGuire
, Athena S. Sefat
, Ronying Jin
, Brian C. Sales
, David Mandrus

Correlated Electron Materials

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

18 Scopus citations

Abstract

We will probe the intrinsic behavior of spin susceptibility χ_spin in the LaFeAsO^1-xF_x superconductor (x ∼ 0.1, T_c ∼ 27 K) using ¹⁹F and ⁷⁵As NMR techniques. Our new results firmly establish a pseudo-gap behavior with Δ_PG/k_B ∼ 140 K. The estimated magnitude of χ_spin at 290 K, χ_spin ∼ 1.8 × 10 ^-4 emu/mol-Fe, is approximately twice larger than that in high T _c cuprates. We also show that χ_spin levels off below ∼50 K down to T_c.

Original language	English
Pages (from-to)	47-53
Number of pages	7
Journal	Journal of the Physical Society of Japan
Volume	77
Issue number	SUPPL. C
DOIs	https://doi.org/10.1143/JPSJS.77SC.47
State	Published - 2008

Keywords

High temperature superconductivity
Iron pnictide superconductor
NMR

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10.1143/JPSJS.77SC.47

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title = "NMR measurements of intrinsic spin susceptibility in LaFeAsO 0.9F0.1",

abstract = "We will probe the intrinsic behavior of spin susceptibility χspin in the LaFeAsO1-xFx superconductor (x ∼ 0.1, Tc ∼ 27 K) using 19F and 75As NMR techniques. Our new results firmly establish a pseudo-gap behavior with ΔPG/kB ∼ 140 K. The estimated magnitude of χspin at 290 K, χspin ∼ 1.8 × 10 -4 emu/mol-Fe, is approximately twice larger than that in high T c cuprates. We also show that χspin levels off below ∼50 K down to Tc.",

keywords = "High temperature superconductivity, Iron pnictide superconductor, NMR",

author = "Takashi Imai and Kanagasingham Ahilan and Fanlong Ning and McGuire, \{Michael A.\} and Sefat, \{Athena S.\} and Ronying Jin and Sales, \{Brian C.\} and David Mandrus",

year = "2008",

doi = "10.1143/JPSJS.77SC.47",

language = "English",

volume = "77",

pages = "47--53",

journal = "Journal of the Physical Society of Japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

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TY - JOUR

T1 - NMR measurements of intrinsic spin susceptibility in LaFeAsO 0.9F0.1

AU - Imai, Takashi

AU - Ahilan, Kanagasingham

AU - Ning, Fanlong

AU - McGuire, Michael A.

AU - Sefat, Athena S.

AU - Jin, Ronying

AU - Sales, Brian C.

AU - Mandrus, David

PY - 2008

Y1 - 2008

N2 - We will probe the intrinsic behavior of spin susceptibility χspin in the LaFeAsO1-xFx superconductor (x ∼ 0.1, Tc ∼ 27 K) using 19F and 75As NMR techniques. Our new results firmly establish a pseudo-gap behavior with ΔPG/kB ∼ 140 K. The estimated magnitude of χspin at 290 K, χspin ∼ 1.8 × 10 -4 emu/mol-Fe, is approximately twice larger than that in high T c cuprates. We also show that χspin levels off below ∼50 K down to Tc.

AB - We will probe the intrinsic behavior of spin susceptibility χspin in the LaFeAsO1-xFx superconductor (x ∼ 0.1, Tc ∼ 27 K) using 19F and 75As NMR techniques. Our new results firmly establish a pseudo-gap behavior with ΔPG/kB ∼ 140 K. The estimated magnitude of χspin at 290 K, χspin ∼ 1.8 × 10 -4 emu/mol-Fe, is approximately twice larger than that in high T c cuprates. We also show that χspin levels off below ∼50 K down to Tc.

KW - High temperature superconductivity

KW - Iron pnictide superconductor

KW - NMR

UR - https://www.scopus.com/pages/publications/57649112875

U2 - 10.1143/JPSJS.77SC.47

DO - 10.1143/JPSJS.77SC.47

M3 - Article

AN - SCOPUS:57649112875

SN - 0031-9015

VL - 77

SP - 47

EP - 53

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - SUPPL. C

ER -

NMR measurements of intrinsic spin susceptibility in LaFeAsO _0.9F_0.1

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Keywords

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