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Title: Instability of the f-electron state in URu2Si2–xPx probed using high magnetic fields

Journal Article · · Physical Review B

The widely studied hidden-order phase in URu2Si2 exemplifies a broad class of emergent macroscopic states originating from d- and f-electron orbitals and their collective modes. This naturally has resulted in a focus on the associated elements (i.e., U and Ru), but recently it was discovered that electronic tuning on the more passive s and p orbitals fundamentally alters the electronic behavior and thus opens opportunities to disentangle the hidden-order conundrum. Here we present a detailed magnetoresistivity study of URu2Si2–xPx, which focuses on two important aspects of this topic. First, we show that the anisotropy of the high field ordered states is preserved after hidden order is destroyed by Si → P chemical substitution, suggesting that this feature is mainly associated with the Kondo lattice, i.e., not hidden order itself. Second, Shubnikov–de Haas oscillations reveal that the observable parts of the Fermi surface topography are robust upon approaching the hidden-order phase boundary and the associated quasiparticle masses remain roughly constant. Furthermore, these observations place constraints on theories and prepare a path towards a resolution to the hidden-order problem.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST); Florida State Univ., Tallahassee, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016568
OSTI ID:
1612649
Alternate ID(s):
OSTI ID: 1546313
Journal Information:
Physical Review B, Vol. 99, Issue 23; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Hidden order and beyond: an experimental—theoretical overview of the multifaceted behavior of URu 2 Si 2 journal January 2020