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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4 Scopus citations

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 languageEnglish (US)
Article number100501
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number10
DOIs
StatePublished - Sep 2 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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