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Title: Pressure-induced collapsed-tetragonal phase in SrCo2As2

Abstract

We present high-energy x-ray diffraction data under applied pressures up to p = 29 GPa, neutron diffraction measurements up to p = 1.1GPa, and electrical resistance measurements up to p = 5.9GPa, on SrCo2As2. Our x-ray diffraction data demonstrate that there is a first-order transition between the tetragonal (T) and collapsed-tetragonal (cT) phases, with an onset above approximately 6 GPa at T = 7K. The pressure for the onset of the cT phase and the range of coexistence between the T and cT phases appears to be nearly temperature independent. The compressibility along the a axis is the same for the T and cT phases, whereas, along the c axis, the cT phase is significantly stiffer, which may be due to the formation of an As-As bond in the cT phase. Our resistivity measurements found no evidence of superconductivity in SrCo2As2 for p 5.9 GPa and T 1.8 K. The resistivity data also show signatures consistent with a pressure-induced phase transition for p 5.5 GPa. Single-crystal neutron diffraction measurements performed up to 1.1 GPa in the T phase found no evidence of stripe-type or A-type antiferromagnetic ordering down to 10 K. Spin-polarized total-energy calculations demonstrate that the cT phase ismore » the stable phase at high pressure with a c a ratio of 2.54. Furthermore, these calculations indicate that the cT phase of SrCo2As2 should manifest either A-type antiferromagnetic or ferromagnetic order.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division
OSTI Identifier:
1247715
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 22; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Jayasekara, W. T., Kaluarachchi, U. S., Ueland, B., Pandey, Abhishek, Lee, Y. B., Taufour, V., Sapkota, A., Kothapalli, K., Sangeetha, N. S., and Feng, Yejun. Pressure-induced collapsed-tetragonal phase in SrCo2As2. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.92.224103.
Jayasekara, W. T., Kaluarachchi, U. S., Ueland, B., Pandey, Abhishek, Lee, Y. B., Taufour, V., Sapkota, A., Kothapalli, K., Sangeetha, N. S., & Feng, Yejun. Pressure-induced collapsed-tetragonal phase in SrCo2As2. United States. doi:10.1103/PhysRevB.92.224103.
Jayasekara, W. T., Kaluarachchi, U. S., Ueland, B., Pandey, Abhishek, Lee, Y. B., Taufour, V., Sapkota, A., Kothapalli, K., Sangeetha, N. S., and Feng, Yejun. Tue . "Pressure-induced collapsed-tetragonal phase in SrCo2As2". United States. doi:10.1103/PhysRevB.92.224103.
@article{osti_1247715,
title = {Pressure-induced collapsed-tetragonal phase in SrCo2As2},
author = {Jayasekara, W. T. and Kaluarachchi, U. S. and Ueland, B. and Pandey, Abhishek and Lee, Y. B. and Taufour, V. and Sapkota, A. and Kothapalli, K. and Sangeetha, N. S. and Feng, Yejun},
abstractNote = {We present high-energy x-ray diffraction data under applied pressures up to p = 29 GPa, neutron diffraction measurements up to p = 1.1GPa, and electrical resistance measurements up to p = 5.9GPa, on SrCo2As2. Our x-ray diffraction data demonstrate that there is a first-order transition between the tetragonal (T) and collapsed-tetragonal (cT) phases, with an onset above approximately 6 GPa at T = 7K. The pressure for the onset of the cT phase and the range of coexistence between the T and cT phases appears to be nearly temperature independent. The compressibility along the a axis is the same for the T and cT phases, whereas, along the c axis, the cT phase is significantly stiffer, which may be due to the formation of an As-As bond in the cT phase. Our resistivity measurements found no evidence of superconductivity in SrCo2As2 for p 5.9 GPa and T 1.8 K. The resistivity data also show signatures consistent with a pressure-induced phase transition for p 5.5 GPa. Single-crystal neutron diffraction measurements performed up to 1.1 GPa in the T phase found no evidence of stripe-type or A-type antiferromagnetic ordering down to 10 K. Spin-polarized total-energy calculations demonstrate that the cT phase is the stable phase at high pressure with a c a ratio of 2.54. Furthermore, these calculations indicate that the cT phase of SrCo2As2 should manifest either A-type antiferromagnetic or ferromagnetic order.},
doi = {10.1103/PhysRevB.92.224103},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 22,
volume = 92,
place = {United States},
year = {2015},
month = {12}
}