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Title: Suppression of magnetism and development of superconductivity within the collapsed tetragonal phase of Ca[subscript 0.67]Sr[subscript 0.33]Fe[subscript 2]As[subscript 2] under pressure

Abstract

Structural and electronic characterizations of (Ca{sub 0.67}Sr{sub 0.33})Fe{sub 2}As{sub 2} have been performed as a function of pressure up to 12 GPa using conventional and designer diamond anvil cells. The compound (Ca{sub 0.67}Sr{sub 0.33})Fe{sub 2}As{sub 2} behaves intermediately between its end members, displaying a suppression of magnetism and the onset of superconductivity. Like other members of the AFe{sub 2}As{sub 2} family, (Ca{sub 0.67}Sr{sub 0.33})Fe{sub 2}As{sub 2} undergoes a pressure-induced isostructural volume collapse, which we associate with the development of As-As bonding across the mirror plane of the structure. This collapsed tetragonal phase abruptly cuts off the magnetic state and supports superconductivity with a maximum T{sub c} = 22.2 K. The maximum T{sub c} of the superconducting phase is not strongly correlated with any structural parameter, but its proximity to the abrupt suppression of magnetism as well as the volume-collapse transition suggests that magnetic interactions and structural inhomogeneity may play a role in its development.

Authors:
; ; ; ; ; ; ;  [1];  [2];  [2]
  1. (LLNL)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
OTHERDOE-NNSAU.S. AIR FORCE- OFFICE OF SCIENTIFIC RESEARCHDOE - OTHER
OSTI Identifier:
1046863
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B
Additional Journal Information:
Journal Volume: 85; Journal Issue: (18) ; 05, 2012
Country of Publication:
United States
Language:
ENGLISH
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BONDING; DIAMONDS; MAGNETISM; MIRRORS; SUPERCONDUCTIVITY

Citation Formats

Jeffries, J.R., Butch, N.P., Kirshenbaum, K., Saha, S.R., Samudrala, G., Weir, S.T., Vohra, Y.K., Paglione, J., UAB), and Maryland). Suppression of magnetism and development of superconductivity within the collapsed tetragonal phase of Ca[subscript 0.67]Sr[subscript 0.33]Fe[subscript 2]As[subscript 2] under pressure. United States: N. p., 2012. Web. doi:10.1103/PhysRevB.85.184501.
Jeffries, J.R., Butch, N.P., Kirshenbaum, K., Saha, S.R., Samudrala, G., Weir, S.T., Vohra, Y.K., Paglione, J., UAB), & Maryland). Suppression of magnetism and development of superconductivity within the collapsed tetragonal phase of Ca[subscript 0.67]Sr[subscript 0.33]Fe[subscript 2]As[subscript 2] under pressure. United States. doi:10.1103/PhysRevB.85.184501.
Jeffries, J.R., Butch, N.P., Kirshenbaum, K., Saha, S.R., Samudrala, G., Weir, S.T., Vohra, Y.K., Paglione, J., UAB), and Maryland). Wed . "Suppression of magnetism and development of superconductivity within the collapsed tetragonal phase of Ca[subscript 0.67]Sr[subscript 0.33]Fe[subscript 2]As[subscript 2] under pressure". United States. doi:10.1103/PhysRevB.85.184501.
@article{osti_1046863,
title = {Suppression of magnetism and development of superconductivity within the collapsed tetragonal phase of Ca[subscript 0.67]Sr[subscript 0.33]Fe[subscript 2]As[subscript 2] under pressure},
author = {Jeffries, J.R. and Butch, N.P. and Kirshenbaum, K. and Saha, S.R. and Samudrala, G. and Weir, S.T. and Vohra, Y.K. and Paglione, J. and UAB) and Maryland)},
abstractNote = {Structural and electronic characterizations of (Ca{sub 0.67}Sr{sub 0.33})Fe{sub 2}As{sub 2} have been performed as a function of pressure up to 12 GPa using conventional and designer diamond anvil cells. The compound (Ca{sub 0.67}Sr{sub 0.33})Fe{sub 2}As{sub 2} behaves intermediately between its end members, displaying a suppression of magnetism and the onset of superconductivity. Like other members of the AFe{sub 2}As{sub 2} family, (Ca{sub 0.67}Sr{sub 0.33})Fe{sub 2}As{sub 2} undergoes a pressure-induced isostructural volume collapse, which we associate with the development of As-As bonding across the mirror plane of the structure. This collapsed tetragonal phase abruptly cuts off the magnetic state and supports superconductivity with a maximum T{sub c} = 22.2 K. The maximum T{sub c} of the superconducting phase is not strongly correlated with any structural parameter, but its proximity to the abrupt suppression of magnetism as well as the volume-collapse transition suggests that magnetic interactions and structural inhomogeneity may play a role in its development.},
doi = {10.1103/PhysRevB.85.184501},
journal = {Phys. Rev. B},
number = (18) ; 05, 2012,
volume = 85,
place = {United States},
year = {2012},
month = {10}
}