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 FeSe_0.4Te_0.6

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

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

226 Citations (Scopus)

Abstract

Neutron scattering is used to probe magnetic excitations in FeSe_0.4Te_0.6 (T_c= 14 K). Low energy spin fluctuations are found with a characteristic wave vector (½ ½ L) that corresponds to Fermi surface nesting and differs from Q_m= (δ0 ½) for magnetic ordering in Fe_1+yTe. A spin resonance with h^-Ω₀= 6.51(4) meV ≈ 5.3k_BT_c and h^-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
Article number	067008
Journal	Physical Review Letters
Volume	103
Issue number	6
Online published	7 Aug 2009
DOIs	https://doi.org/10.1103/PhysRevLett.103.067008
Publication status	Published - 7 Aug 2009
Externally published	Yes

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@article{0a1bb5e10e144cbe9887c09016c14808,

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 = 14 K). Low energy spin fluctuations are found with a characteristic wave vector (½ ½ L) that corresponds to Fermi surface nesting and differs from Qm = (δ0 ½) for magnetic ordering in Fe1+yTe. A spin resonance with h-Ω0 = 6.51(4) meV ≈ 5.3kBTc and h-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.",

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

year = "2009",

month = aug,

day = "7",

doi = "10.1103/PhysRevLett.103.067008",

language = "English",

volume = "103",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

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TY - JOUR

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 = 14 K). Low energy spin fluctuations are found with a characteristic wave vector (½ ½ L) that corresponds to Fermi surface nesting and differs from Qm = (δ0 ½) for magnetic ordering in Fe1+yTe. A spin resonance with h-Ω0 = 6.51(4) meV ≈ 5.3kBTc and h-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 = 14 K). Low energy spin fluctuations are found with a characteristic wave vector (½ ½ L) that corresponds to Fermi surface nesting and differs from Qm = (δ0 ½) for magnetic ordering in Fe1+yTe. A spin resonance with h-Ω0 = 6.51(4) meV ≈ 5.3kBTc and h-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.

UR - http://www.scopus.com/inward/record.url?scp=68849099792&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-68849099792&origin=recordpage

U2 - 10.1103/PhysRevLett.103.067008

DO - 10.1103/PhysRevLett.103.067008

M3 - RGC 21 - Publication in refereed journal

SN - 0031-9007

VL - 103

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 067008

ER -

Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe_0.4Te_0.6

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Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe_0.4Te_0.6