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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • 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
  • C. Broholm

Detail(s)

Original languageEnglish
Article number100501
Journal / PublicationPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number10
Online published1 Sep 2014
Publication statusPublished - 2 Sep 2014
Externally publishedYes

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.

Citation Format(s)

Modified magnetism within the coherence volume of superconducting Fe1+δ Sex Te1-x. / Leiner, J.; Thampy, V.; Christianson, A. D.; Abernathy, D. L.; Stone, M. B.; Lumsden, M. D.; Sefat, A. S.; Sales, B. C.; Hu, Jin; Mao, Zhiqiang; Bao, Wei; Broholm, C.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 10, 100501, 02.09.2014.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review