Valence instability across the magnetostructural transition in USb2

Brubaker, Z. E.; Xiao, Y.; Chow, P.; Kenney-Benson, C.; Smith, J. S.; Cynn, H.; Reynolds, C.; Butch, N. P.; Zieve, R. J.; Jeffries, J. R.

doi:10.1103/PhysRevB.101.085123

Title: Valence instability across the magnetostructural transition in ${USb}_{2}$

Journal Article · 14 February 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.101.085123 · OSTI ID:1606746

^[1]; Xiao, Y. ^[2]; Chow, P. ^[2]; Kenney-Benson, C. ^[2]; Smith, J. S. ^[2]; Cynn, H. ^[3]; Reynolds, C. ^[3]; Butch, N. P. ^[4]; Zieve, R. J. ^[5]; Jeffries, J. R. ^[3]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States). Dept. of Physics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Univ. of Maryland, College Park, MD (United States). Dept. of Physics
Univ. of California, Davis, CA (United States). Dept. of Physics

We have performed pressure-dependent x-ray diffraction and resonant x-ray emission spectroscopy experiments on USb₂ to further characterize the antiferromagnetic-ferromagnetic transition occurring near 8 GPa. We have found the magnetic transition coincides with a tetragonal to orthorhombic transition resulting in a 17% volume collapse as well as a transient f-occupation enhancement. Compared to UAs₂ and UAsS, USb₂ shows a reduced bulk modulus and transition pressure and an increased volume collapse at the structural transition. Except for an enhancement across the transition region, the f occupancy decreases steadily from 1.96 to 1.75.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; AC52- 07NA27344; AC02-06CH11357; FG02-13ER41967; AC52-07NA27344

OSTI ID:: 1606746

Alternate ID(s):: OSTI ID: 1599686; OSTI ID: 1614754; OSTI ID: 1769144

Report Number(s):: LLNL-JRNL-772386; PRBMDO; TRN: US2104554

Journal Information:: Physical Review B, Vol. 101, Issue 8; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Valence instability across the magnetostructural transition in ${USb}_{2}$