Spin susceptibility, phase diagram, and quantum criticality in the eelctron-doped high Tc superconductor Ba(Fe1-xCo x)2As2

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

doi:10.1143/JPSJ.78.013711

Spin susceptibility, phase diagram, and quantum criticality in the eelctron-doped high T_c superconductor Ba(Fe_1-xCo _x)₂As₂

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

Correlated Electron Materials

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163 Scopus citations

Abstract

We report a systematic investigation of Ba(Fe_1-xCo _x)₂As₂ based on transport and ⁷⁵As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low frequency spin fluctuations. The optimum superconducting phase emerges at x _c ≃ 0.08 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near x_c between the SDW (spin density wave) and superconducting phases.

Original language	English
Article number	013711
Journal	Journal of the Physical Society of Japan
Volume	78
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.78.013711
State	Published - Jan 2009

Keywords

High temperature superconductivity
Iron pnictide superconductor
NMR
Quantum criticality

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title = "Spin susceptibility, phase diagram, and quantum criticality in the eelctron-doped high Tc superconductor Ba(Fe1-xCo x)2As2",

abstract = "We report a systematic investigation of Ba(Fe1-xCo x)2As2 based on transport and 75As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low frequency spin fluctuations. The optimum superconducting phase emerges at x c ≃ 0.08 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near xc between the SDW (spin density wave) and superconducting phases.",

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

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AU - Ning, Fanlong

AU - Ahilan, Kanagasingham

AU - Imai, Takashi

AU - Sefat, Athena S.

AU - Jin, Ronying

AU - McGuire, Michael A.

AU - Sales, Brian C.

AU - Mandrus, David

PY - 2009/1

Y1 - 2009/1

N2 - We report a systematic investigation of Ba(Fe1-xCo x)2As2 based on transport and 75As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low frequency spin fluctuations. The optimum superconducting phase emerges at x c ≃ 0.08 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near xc between the SDW (spin density wave) and superconducting phases.

AB - We report a systematic investigation of Ba(Fe1-xCo x)2As2 based on transport and 75As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low frequency spin fluctuations. The optimum superconducting phase emerges at x c ≃ 0.08 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near xc between the SDW (spin density wave) and superconducting phases.

KW - High temperature superconductivity

KW - Iron pnictide superconductor

KW - NMR

KW - Quantum criticality

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SN - 0031-9015

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JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

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M1 - 013711

ER -

Spin susceptibility, phase diagram, and quantum criticality in the eelctron-doped high T_c superconductor Ba(Fe_1-xCo _x)₂As₂

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Keywords

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