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Title: Pressure-induced collapsed-tetragonal phase in SrCo 2 As 2

We present high-energy x-ray diffraction data under applied pressures up to p = 29GPa, neutron diffraction measurements up to p = 1.1GPa, and electrical resistance measurements up to p = 5.9GPa, on SrCo 2As 2. 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 SrCo 2As 2 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 calculationsmore » demonstrate that the cT phase is the stable phase at high pressure with a ca ratio of 2.54. As a result, these calculations indicate that the cT phase of SrCo 2As 2 should manifest either A-type antiferromagnetic or ferromagnetic order.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Report Number(s):
IS-J-8798
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
FG02-94ER14466; AC02-07CH11358; FG02-99ER45775; AC02-06CH11357; EAR1157758; EAR1128799; NA0001974; AC05-00OR22725
Type:
Accepted Manuscript
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)
Research Org:
Ames Lab., Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1234447
Alternate Identifier(s):
OSTI ID: 1228422; OSTI ID: 1334455

Jayasekara, W. T., Kaluarachchi, U. S., Ueland, B. G., Pandey, Abhishek, Lee, Y. B., Taufour, V., Sapkota, A., Kothapalli, K., Sangeetha, N. S., Fabbris, G., Veiga, L. S. I., Feng, Yejun, dos Santos, A. M., Bud'ko, S. L., Harmon, B. N., Canfield, P. C., Johnston, D. C., Kreyssig, A., and Goldman, A. I.. Pressure-induced collapsed-tetragonal phase in SrCo2As2. United States: N. p., Web. doi:10.1103/PhysRevB.92.224103.
Jayasekara, W. T., Kaluarachchi, U. S., Ueland, B. G., Pandey, Abhishek, Lee, Y. B., Taufour, V., Sapkota, A., Kothapalli, K., Sangeetha, N. S., Fabbris, G., Veiga, L. S. I., Feng, Yejun, dos Santos, A. M., Bud'ko, S. L., Harmon, B. N., Canfield, P. C., Johnston, D. C., Kreyssig, A., & Goldman, A. I.. Pressure-induced collapsed-tetragonal phase in SrCo2As2. United States. doi:10.1103/PhysRevB.92.224103.
Jayasekara, W. T., Kaluarachchi, U. S., Ueland, B. G., Pandey, Abhishek, Lee, Y. B., Taufour, V., Sapkota, A., Kothapalli, K., Sangeetha, N. S., Fabbris, G., Veiga, L. S. I., Feng, Yejun, dos Santos, A. M., Bud'ko, S. L., Harmon, B. N., Canfield, P. C., Johnston, D. C., Kreyssig, A., and Goldman, A. I.. 2015. "Pressure-induced collapsed-tetragonal phase in SrCo2As2". United States. doi:10.1103/PhysRevB.92.224103. https://www.osti.gov/servlets/purl/1234447.
@article{osti_1234447,
title = {Pressure-induced collapsed-tetragonal phase in SrCo2As2},
author = {Jayasekara, W. T. and Kaluarachchi, U. S. and Ueland, B. G. and Pandey, Abhishek and Lee, Y. B. and Taufour, V. and Sapkota, A. and Kothapalli, K. and Sangeetha, N. S. and Fabbris, G. and Veiga, L. S. I. and Feng, Yejun and dos Santos, A. M. and Bud'ko, S. L. and Harmon, B. N. and Canfield, P. C. and Johnston, D. C. and Kreyssig, A. and Goldman, A. I.},
abstractNote = {We present high-energy x-ray diffraction data under applied pressures up to p = 29GPa, 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 ca ratio of 2.54. As a result, 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},
number = 22,
volume = 92,
place = {United States},
year = {2015},
month = {12}
}