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PUBLICATIONS

Persistent Fe Moments in the Normal-State Collapsed-Tetragonal Phase of the Pressure-induced Superconductor Ca0.67Sr0.33Fe2As2

Published

Author(s)

J.R. Jeffries, Nicholas Butch, M.J. Lipp, J.A. Bradley, K. Kirshenbaum, Shanta Saha, J. Paglione, C. Kenny-Benson, Y. Xiao, P. Chow, W. J. Evans

Abstract

Using non-resonant Fe Κ}β x-ray emission spectroscopy, we reveal that Sr-doping of CaFe2As2 decouples the Fe moment from the volume collapse transition, yielding a collapsed-tetragonal, para-magnetic normal state out of which superconductivity develops. X-ray diffraction measurements implicate the c-axis lattice parameter as the controlling criterion for the Fe moment, promoting a generic description for the appearance of pressure-induced superconductivity in the alkaline-earth-based 122 ferropnictides (AFe2As2). The evolution of Tc with pressure lends support to theories for superconductivity involving unconventional pairing mediated by magnetic fluctuations.
Citation
Physical Review B
Volume
90
Issue
14
Pub Type
Journals

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Citation

Jeffries, J. , Butch, N. , Lipp, M. , Bradley, J. , Kirshenbaum, K. , Saha, S. , Paglione, J. , Kenny-Benson, C. , Xiao, Y. , Chow, P. and Evans, W. (2014), Persistent Fe Moments in the Normal-State Collapsed-Tetragonal Phase of the Pressure-induced Superconductor Ca<sub>0.67</sub>Sr<sub>0.33</sub>Fe<sub>2</sub>As<sub>2</sub>, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915046 (Accessed May 1, 2024)

Created October 12, 2014, Updated October 12, 2021