Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
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.
- Publication:
-
Physical Review B
- Pub Date:
- November 2008
- DOI:
- arXiv:
- arXiv:0807.3032
- Bibcode:
- 2008PhRvB..78r4517K
- Keywords:
-
- 74.62.Fj;
- 61.50.Ks;
- 61.05.fm;
- 71.15.Nc;
- Pressure effects;
- Crystallographic aspects of phase transformations;
- pressure effects;
- Neutron diffraction;
- Total energy and cohesive energy calculations;
- Condensed Matter - Superconductivity;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- accepted for publication in Phys. Rev. B