The Structural Phase Transition in FeSe (Fe1+dSe)

T. M. McQueen; A. J. Williams; P. W. Stephens; J. Tao; Y. Zhu; V. Ksenofontov; F. Casper; C. Felser; R. J. Cava

doi:10.1103/PhysRevLett.103.057002

The Structural Phase Transition in FeSe (Fe1+dSe)

Superconductivity 2009-08-11 v1 Strongly Correlated Electrons

Authors: T. M. McQueen , A. J. Williams , P. W. Stephens , J. Tao , Y. Zhu , V. Ksenofontov , F. Casper , C. Felser , R. J. Cava

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Abstract

In this letter we show that superconducting Fe1.01Se undergoes a structural transition at 90 K from a tetragonal to an orthorhombic phase but that non-superconducting Fe1.03Se does not. Further, high resolution electron microscopy study at low temperatures reveals an unexpected additional modulation of the crystal structure of the superconducting phase involving displacements of the Fe atoms, and that the non-superconducting material shows a distinct, complex nanometer-scale structural modulation. Finally, we show that magnetism is not the driving force for the phase transition in the superconducting phase.

Keywords

iron-based superconductor single crystal superconductivity high-temperature superconductivity

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@article{arxiv.0905.1065,
  title  = {The Structural Phase Transition in FeSe (Fe1+dSe)},
  author = {T. M. McQueen and A. J. Williams and P. W. Stephens and J. Tao and Y. Zhu and V. Ksenofontov and F. Casper and C. Felser and R. J. Cava},
  journal= {arXiv preprint arXiv:0905.1065},
  year   = {2009}
}

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5 pages, 5 figures

The Structural Phase Transition in FeSe (Fe1+dSe)

Abstract

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