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Valence Instability Across the Magnetostructural Transition in USb2



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


We have performed pressure dependent X-ray diffraction and resonant X-ray emission spectroscopy experiments on USb2 to further characterize the AFM-FM transition occuring 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. With increasing atomic size, the UX2 structure shows a decreasing bulk modulus and transition pressure, and an increasing 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.
Physical Review B


X-ray absorption spectroscopy, valence, antiferromagnet


Brubaker, Z. , Xiao, Y. , Chow, P. , Kenney-Benson, C. , Smith, J. , Cynn, H. , Reynolds, C. , Butch, N. , Zieve, R. and Jeffries, J. (2020), Valence Instability Across the Magnetostructural Transition in USb<sub>2</sub>, Physical Review B, [online], (Accessed April 23, 2024)
Created February 13, 2020, Updated October 12, 2021