High temperature singlet-based magnetism from Hund’s rule correlations

Lin Miao, Rourav Basak, Sheng Ran, Yishuai Xu, Erica Kotta, Haowei He, Jonathan D. Denlinger, Yi- De Chuang, Y. Zhao, Z. Xu, J. W. Lynn, J. R. Jeffries, S. R. Saha, Ioannis Giannakis, Pegor Aynajian, Chang-Jong Kang, Yilin Wang, Gabriel Kotliar, Nicholas P. Butch and L. Andrew Wray ()
Additional contact information
Lin Miao: New York University
Rourav Basak: New York University
Sheng Ran: National Institute of Standards and Technology
Yishuai Xu: New York University
Erica Kotta: New York University
Haowei He: New York University
Jonathan D. Denlinger: Advanced Light Source, Lawrence Berkeley National Laboratory
Yi- De Chuang: Advanced Light Source, Lawrence Berkeley National Laboratory
Y. Zhao: National Institute of Standards and Technology
Z. Xu: National Institute of Standards and Technology
J. W. Lynn: National Institute of Standards and Technology
J. R. Jeffries: Materials Science Division, Lawrence Livermore National Laboratory
S. R. Saha: National Institute of Standards and Technology
Ioannis Giannakis: Binghamton University
Pegor Aynajian: Binghamton University
Chang-Jong Kang: Rutgers University
Yilin Wang: Brookhaven National Laboratory
Gabriel Kotliar: Rutgers University
Nicholas P. Butch: National Institute of Standards and Technology
L. Andrew Wray: New York University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Uranium compounds can manifest a wide range of fascinating many-body phenomena, and are often thought to be poised at a crossover between localized and itinerant regimes for 5f electrons. The antiferromagnetic dipnictide USb2 has been of recent interest due to the discovery of rich proximate phase diagrams and unusual quantum coherence phenomena. Here, linear-dichroic X-ray absorption and elastic neutron scattering are used to characterize electronic symmetries on uranium in USb2 and isostructural UBi2. Of these two materials, only USb2 is found to enable strong Hund’s rule alignment of local magnetic degrees of freedom, and to undergo distinctive changes in local atomic multiplet symmetry across the magnetic phase transition. Theoretical analysis reveals that these and other anomalous properties of the material may be understood by attributing it as the first known high temperature realization of a singlet ground state magnet, in which magnetism occurs through a process that resembles exciton condensation.

Date: 2019
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DOI: 10.1038/s41467-019-08497-3

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