Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering

A. Kreyssig; M. A. Green; Y. Lee; G. D. Samolyuk; P. Zajdel; J. W. Lynn; S. L. Bud'ko; M. S. Torikachvili; N. Ni; S. Nandi; J. Leao; S. J. Poulton; D. N. Argyriou; B. N. Harmon; P. C. Canfield; R. J. McQueeney; A. I. Goldman

doi:10.1103/PhysRevB.78.184517

Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering

Superconductivity 2008-11-25 v3 Strongly Correlated Electrons

Authors: A. Kreyssig , M. A. Green , Y. Lee , G. D. Samolyuk , P. Zajdel , J. W. Lynn , S. L. Bud'ko , M. S. Torikachvili , N. Ni , S. Nandi , J. Leao , S. J. Poulton , D. N. Argyriou , B. N. Harmon , P. C. Canfield , R. J. McQueeney , A. I. Goldman

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Abstract

Recent investigations of the superconducting iron-arsenide families have highlighted the role of pressure, be it chemical or mechanical, in fostering superconductivity. Here we report that CaFe2As2 undergoes a pressure-induced transition to a non-magnetic, volume "collapsed" tetragonal phase, which becomes superconducting at lower temperature. Spin-polarized total-energy calculations on the collapsed structure reveal that the magnetic Fe moment itself collapses, consistent with the absence of magnetic order in neutron diffraction.

Keywords

iron-arsenide superconductors pressure-induced phase transition volume-collapsed tetragonal phase neutron scattering magnetic moment collapse CaFe2As2

Cite

@article{arxiv.0807.3032,
  title  = {Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering},
  author = {A. Kreyssig and M. A. Green and Y. Lee and G. D. Samolyuk and P. Zajdel and J. W. Lynn and S. L. Bud'ko and M. S. Torikachvili and N. Ni and S. Nandi and J. Leao and S. J. Poulton and D. N. Argyriou and B. N. Harmon and P. C. Canfield and R. J. McQueeney and A. I. Goldman},
  journal= {arXiv preprint arXiv:0807.3032},
  year   = {2008}
}

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accepted for publication in Phys. Rev. B

Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering

Abstract

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