Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
12-1-2015
Journal or Book Title
Physical Review B
Volume
92
Issue
22
First Page
224103
DOI
10.1103/PhysRevB.92.224103
Abstract
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. Furthermore, these calculations indicate that the cT phase of SrCo2As2 should manifest either A-type antiferromagnetic or ferromagnetic order.
Copyright Owner
American Physical Society
Copyright Date
2015
Language
en
File Format
application/pdf
Recommended Citation
Jayasekara, W. T.; Kaluarachchi, U. S.; Ueland, Benjamin G.; Pandey, Abhishek; Lee, Y. B.; Taufour, V.; Sapkota, A.; Kothapalli, K.; Sangeetha, Nediadath S.; Fabbris, G.; Veiga, L. S. I.; Feng, Yejun; dos Santos, A. M.; Bud’ko, Sergey L.; Harmon, B. N.; Canfield, Paul C.; Johnston, David C.; Kreyssig, Andreas; and Goldman, Alan I., "Pressure-induced collapsed-tetragonal phase in SrCo2As2" (2015). Physics and Astronomy Publications. 589.
https://lib.dr.iastate.edu/physastro_pubs/589
Comments
This article is published as Jayasekara, W. T., U. S. Kaluarachchi, B. G. Ueland, Abhishek Pandey, Y. B. Lee, V. Taufour, A. Sapkota, K. Kothapalli, N. S. Sangeetha, G. Fabbris, L. S. I. Veiga, Yejun Feng, A. M. dos Santos, S. L. Bud'ko, B. N. Harmon, P. C. Canfield, D. C. Johnston, A. Kreyssig, and A. I. Goldman. "Pressure-induced collapsed-tetragonal phase in SrCo 2 As 2." Physical Review B 92, no. 22 (2015): 224103. DOI: 10.1103/PhysRevB.92.224103. Posted with permission.