Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6

Yiming Qiu; Wei Bao; Y. Zhao; Collin Broholm; V. Stanev; Z. Tesanovic; Y. C. Gasparovic; S. Chang; Jin Hu; Bin Qian; Minghu Fang; Zhiqiang Mao

doi:10.1103/PhysRevLett.103.067008

Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6

Yiming Qiu, Wei Bao, Y. Zhao, Collin Broholm, V. Stanev, Z. Tesanovic, Y. C. Gasparovic, S. Chang, Jin Hu, Bin Qian, Minghu Fang, Zhiqiang Mao

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Abstract

Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (Tc=14K). Low energy spin fluctuations are found with a characteristic wave vector (1212L) that corresponds to Fermi surface nesting and differs from Qm=(δ012) for magnetic ordering in Fe1+yTe. A spin resonance with Ω0=6.51(4)meV 5.3kBTc and Γ=1.25(5)meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s± superconductivity and imperfect quasi-2D Fermi surface nesting.

Original language	English (US)
Article number	067008
Journal	Physical review letters
Volume	103
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.103.067008
State	Published - Aug 7 2009

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.103.067008

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title = "Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6",

abstract = "Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (Tc=14K). Low energy spin fluctuations are found with a characteristic wave vector (1212L) that corresponds to Fermi surface nesting and differs from Qm=(δ012) for magnetic ordering in Fe1+yTe. A spin resonance with Ω0=6.51(4)meV 5.3kBTc and Γ=1.25(5)meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s± superconductivity and imperfect quasi-2D Fermi surface nesting.",

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doi = "10.1103/PhysRevLett.103.067008",

language = "English (US)",

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T1 - Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6

AU - Qiu, Yiming

AU - Bao, Wei

AU - Zhao, Y.

AU - Broholm, Collin

AU - Stanev, V.

AU - Tesanovic, Z.

AU - Gasparovic, Y. C.

AU - Chang, S.

AU - Hu, Jin

AU - Qian, Bin

AU - Fang, Minghu

AU - Mao, Zhiqiang

PY - 2009/8/7

Y1 - 2009/8/7

N2 - Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (Tc=14K). Low energy spin fluctuations are found with a characteristic wave vector (1212L) that corresponds to Fermi surface nesting and differs from Qm=(δ012) for magnetic ordering in Fe1+yTe. A spin resonance with Ω0=6.51(4)meV 5.3kBTc and Γ=1.25(5)meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s± superconductivity and imperfect quasi-2D Fermi surface nesting.

AB - Neutron scattering is used to probe magnetic excitations in FeSe0.4Te0.6 (Tc=14K). Low energy spin fluctuations are found with a characteristic wave vector (1212L) that corresponds to Fermi surface nesting and differs from Qm=(δ012) for magnetic ordering in Fe1+yTe. A spin resonance with Ω0=6.51(4)meV 5.3kBTc and Γ=1.25(5)meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s± superconductivity and imperfect quasi-2D Fermi surface nesting.

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Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6

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