Pressure-induced collapsed-tetragonal phase in SrCo2As2

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.

doi:10.1103/PhysRevB.92.224103

Pressure-induced collapsed-tetragonal phase in ${SrCo}_{2} {As}_{2}$

Journal Article · Tue Dec 08 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.224103· OSTI ID:1234447

Jayasekara, W. T. ^[1]; Kaluarachchi, U. S. ^[1]; Ueland, B. G. ^[1]; Pandey, Abhishek ^[1]; Lee, Y. B. ^[1]; Taufour, V. ^[1]; Sapkota, A. ^[1]; Kothapalli, K. ^[1]; Sangeetha, N. S. ^[1]; Fabbris, G. ^[2]; Veiga, L. S. I. ^[2]; Feng, Yejun ^[2]; dos Santos, A. M. ^[3]; Bud'ko, S. L. ^[1]; Harmon, B. N. ^[1]; Canfield, P. C. ^[1]; Johnston, D. C. ^[1]; Kreyssig, A. ^[1]; Goldman, A. I. ^[1]

Iowa State Univ., Ames, IA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Lab. (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357; AC02-07CH11358; AC05-00OR22725; FG02-94ER14466; FG02-99ER45775; NA0001974

OSTI ID:: 1234447

Alternate ID(s):: OSTI ID: 1334455
OSTI ID: 1228422
OSTI ID: 1247715

Report Number(s):: IS-J--8798

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 92; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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