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

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arxiv 0807.3032 v3 pith:A5WWYT25 submitted 2008-07-18 cond-mat.supr-con cond-mat.str-el

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
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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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classification cond-mat.supr-con cond-mat.str-el
keywords cafe2as2collapsedmagneticneutronphasepressure-inducedsuperconductingtetragonal
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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.

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