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 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

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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.

Original language	English
Article number	100501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.90.100501
State	Published - Sep 2 2014

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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 Fe1+δ Sex Te1-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",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

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doi = "10.1103/PhysRevB.90.100501",

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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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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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ER -

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

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