Kreyssig, A.
, Green, M.
, Lee, Y.
, Samolyuk, G.
, Zajdel, P.
, Lynn, J.
, Bud'Ko, S.
, Torikachvili, M.
, Ni, N.
, Nandi, S.
, Leao, J.
, Poulton, S.
, Argyriou, D.
, Harmon, B.
, McQueeny, R.
, Canfield, P.
and Goldman, A.
(2008),
Pressure-induced volume-collapsed tetragonal phase of CaFe 2 As 2 as seen via neutron scattering, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.78.184517, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=610030
(Accessed October 8, 2025)
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Pressure-induced volume-collapsed tetragonal phase of CaFe 2 As 2 as seen via neutron scattering
Published
Author(s)
A. Kreyssig, , Y. Lee, G. D. Samolyuk, , , S. L. Bud'ko, M. S. Torikachvili, N. Ni, S. Nandi, , , D. N. Argyriou, B. N. Harmon, R. J. McQueeny, P. C. Canfield, A. I. Goldman
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 nonmagnetic 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.Citation
Physical Review B
Volume
78
Issue
18
Pub Type
Journals
Download Paper
Keywords
neutron diffraction, magnetic order, structural phase transition, pressure, iron-based superconductor
Citation
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Created November 24, 2008, Updated March 25, 2024