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

Research output: Contribution to journalArticle

192 Citations (Scopus)

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 languageEnglish (US)
Article number067008
JournalPhysical Review Letters
Volume103
Issue number6
DOIs
StatePublished - Aug 7 2009

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Fermi surfaces
magnetic probes
spin resonance
neutron scattering
superconductivity
continuums
excitation
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Qiu, Yiming ; Bao, Wei ; Zhao, Y. ; Broholm, Collin ; Stanev, V. ; Tesanovic, Z. ; Gasparovic, Y. C. ; Chang, S. ; Hu, Jin ; Qian, Bin ; Fang, Minghu ; Mao, Zhiqiang. / Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6. In: Physical Review Letters. 2009 ; Vol. 103, No. 6.
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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.",
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Qiu, Y, Bao, W, Zhao, Y, Broholm, C, Stanev, V, Tesanovic, Z, Gasparovic, YC, Chang, S, Hu, J, Qian, B, Fang, M & Mao, Z 2009, 'Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6', Physical Review Letters, vol. 103, no. 6, 067008. https://doi.org/10.1103/PhysRevLett.103.067008

Spin gap and resonance at the nesting wave vector in superconducting FeSe0.4Te0.6. / Qiu, Yiming; Bao, Wei; Zhao, Y.; Broholm, Collin; Stanev, V.; Tesanovic, Z.; Gasparovic, Y. C.; Chang, S.; Hu, Jin; Qian, Bin; Fang, Minghu; Mao, Zhiqiang.

In: Physical Review Letters, Vol. 103, No. 6, 067008, 07.08.2009.

Research output: Contribution to journalArticle

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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

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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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