Modified magnetism within the coherence volume of superconducting Fe1+δ Sex Te1-x

J. Leiner; V. Thampy; A. D. Christianson; D. L. Abernathy; M. B. Stone; M. D. Lumsden; A. S. Sefat; B. C. Sales; Jin Hu; Zhiqiang Mao; Wei Bao; C. Broholm

doi:10.1103/PhysRevB.90.100501

Modified magnetism within the coherence volume of superconducting Fe_1+δ Se_x Te_1-x

J. Leiner^*, V. Thampy, A. D. Christianson, D. L. Abernathy, M. B. Stone, M. D. Lumsden, A. S. Sefat, B. C. Sales, Jin Hu, Zhiqiang Mao, Wei Bao, C. Broholm

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

Neutron scattering is used to probe magnetic interactions as superconductivity develops in optimally doped Fe_1+δSe_xTe_1-x. Applying the first moment sum rule to comprehensive neutron scattering data, we extract the change in magnetic exchange energy Δ[ J_R-R′⟨S_R·S_R′⟩] in the superconducting state referenced to the normal state. Oscillatory changes are observed for Fe-Fe displacements |ΔR| < ξ, where ξ = 1.3(1) nm is the superconducting coherence length. Dominated by a large reduction in the second nearest neighbor exchange energy [-1.2(2) meV/Fe], the overall reduction in magnetic interaction energy is Δ⟨H_mag⟩=-0.31(9) meV/Fe. Comparison to the superconducting condensation energy ΔE_SC=-0.013(1) meV/Fe, which we extract from specific heat data, suggests the modified magnetism we probe drives superconductivity in Fe_1+δSe_xTe_1-x.

Original language	English
Article number	100501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	10
Online published	1 Sept 2014
DOIs	https://doi.org/10.1103/PhysRevB.90.100501
Publication status	Published - 2 Sept 2014
Externally published	Yes

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Leiner, J., Thampy, V., Christianson, A. D., Abernathy, D. L., Stone, M. B., Lumsden, M. D., Sefat, A. S., Sales, B. C., Hu, J., Mao, Z., Bao, W., & Broholm, C. (2014). Modified magnetism within the coherence volume of superconducting Fe_1+δ Se_x Te_1-x. Physical Review B - Condensed Matter and Materials Physics, 90(10), Article 100501. https://doi.org/10.1103/PhysRevB.90.100501

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title = "Modified magnetism within the coherence volume of superconducting Fe1+δ Sex Te1-x",

abstract = "Neutron scattering is used to probe magnetic interactions as superconductivity develops in optimally doped Fe1+δSexTe1-x. Applying the first moment sum rule to comprehensive neutron scattering data, we extract the change in magnetic exchange energy Δ[ JR-R′⟨SR·SR′⟩] in the superconducting state referenced to the normal state. Oscillatory changes are observed for Fe-Fe displacements |ΔR| < ξ, where ξ = 1.3(1) nm is the superconducting coherence length. Dominated by a large reduction in the second nearest neighbor exchange energy [-1.2(2) meV/Fe], the overall reduction in magnetic interaction energy is Δ⟨Hmag⟩=-0.31(9) meV/Fe. Comparison to the superconducting condensation energy ΔESC=-0.013(1) meV/Fe, which we extract from specific heat data, suggests the modified magnetism we probe drives superconductivity in Fe1+δSexTe1-x.",

author = "J. Leiner and V. Thampy and Christianson, {A. D.} and Abernathy, {D. L.} and Stone, {M. B.} and Lumsden, {M. D.} and Sefat, {A. S.} and Sales, {B. C.} and Jin Hu and Zhiqiang Mao and Wei Bao and C. Broholm",

year = "2014",

month = sep,

day = "2",

doi = "10.1103/PhysRevB.90.100501",

language = "English",

volume = "90",

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TY - JOUR

T1 - Modified magnetism within the coherence volume of superconducting Fe1+δ Sex Te1-x

AU - Leiner, J.

AU - Thampy, V.

AU - Christianson, A. D.

AU - Abernathy, D. L.

AU - Stone, M. B.

AU - Lumsden, M. D.

AU - Sefat, A. S.

AU - Sales, B. C.

AU - Hu, Jin

AU - Mao, Zhiqiang

AU - Bao, Wei

AU - Broholm, C.

PY - 2014/9/2

Y1 - 2014/9/2

N2 - Neutron scattering is used to probe magnetic interactions as superconductivity develops in optimally doped Fe1+δSexTe1-x. Applying the first moment sum rule to comprehensive neutron scattering data, we extract the change in magnetic exchange energy Δ[ JR-R′⟨SR·SR′⟩] in the superconducting state referenced to the normal state. Oscillatory changes are observed for Fe-Fe displacements |ΔR| < ξ, where ξ = 1.3(1) nm is the superconducting coherence length. Dominated by a large reduction in the second nearest neighbor exchange energy [-1.2(2) meV/Fe], the overall reduction in magnetic interaction energy is Δ⟨Hmag⟩=-0.31(9) meV/Fe. Comparison to the superconducting condensation energy ΔESC=-0.013(1) meV/Fe, which we extract from specific heat data, suggests the modified magnetism we probe drives superconductivity in Fe1+δSexTe1-x.

AB - Neutron scattering is used to probe magnetic interactions as superconductivity develops in optimally doped Fe1+δSexTe1-x. Applying the first moment sum rule to comprehensive neutron scattering data, we extract the change in magnetic exchange energy Δ[ JR-R′⟨SR·SR′⟩] in the superconducting state referenced to the normal state. Oscillatory changes are observed for Fe-Fe displacements |ΔR| < ξ, where ξ = 1.3(1) nm is the superconducting coherence length. Dominated by a large reduction in the second nearest neighbor exchange energy [-1.2(2) meV/Fe], the overall reduction in magnetic interaction energy is Δ⟨Hmag⟩=-0.31(9) meV/Fe. Comparison to the superconducting condensation energy ΔESC=-0.013(1) meV/Fe, which we extract from specific heat data, suggests the modified magnetism we probe drives superconductivity in Fe1+δSexTe1-x.

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U2 - 10.1103/PhysRevB.90.100501

DO - 10.1103/PhysRevB.90.100501

M3 - RGC 21 - Publication in refereed journal

SN - 1098-0121

VL - 90

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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