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, and, A. I. Goldman
TL;DR
This study reveals that applying pressure to CaFe2As2 induces a non-magnetic, volume-collapsed tetragonal phase that becomes superconducting at lower temperatures, with magnetic moments collapsing as confirmed by neutron scattering and calculations.
Contribution
It demonstrates the pressure-induced transition to a non-magnetic phase in CaFe2As2 and links structural collapse to the disappearance of magnetic moments and emergence of superconductivity.
Findings
Pressure induces a volume-collapsed tetragonal phase.
Magnetic Fe moments collapse in the new phase.
Superconductivity appears at lower temperatures.
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.
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