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

TitlePressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
Publication TypeJournal Article
Year of Publication2008
AuthorsKreyssig A, Green MA, Lee Y, Samolyuk GD, Zajdel P, Lynn JW, Bud'ko SL, Torikachvili MS, Ni N, Nandi S, Leao JB, Poulton SJ, Argyriou DN, Harmon BN, McQueeney RJ, Canfield PC, Goldman AI
Journal TitlePhysical Review B
Volume78
Pages184517
Date Published11/01
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000261214800101
Keywords43 k, lao1-xfxfeas, superconductivity
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.
DOI10.1103/PhysRevB.78.184517
Alternate JournalPhys. Rev. B