Phase diagram of URu_2-xFe_xSi₂ in high magnetic fields

Technical Report · Wed Mar 01 00:00:00 EST 2017

DOI:https://doi.org/10.2172/1345910· OSTI ID:1345910

Ran, S. ^[1]; Jeon, I. ^[1]; Kanchanavatee, N. ^[1]; Huang, K. ^[1]; Maple, M. B. ^[1]; Gallagher, A. ^[2]; Chen, K. ^[2]; Graf, D. ^[2]; Baumbach, R. E. ^[2]; Singleton, John ^[3]

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1. Univ. of California, San Diego, CA (United States)
2. Florida State Univ., Tallahassee, FL (United States)
3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The search for the order parameter of the hidden order (HO) phase in URu₂Si₂ has attracted an enormous amount of attention for the past three decades. Measurements in high magnetic fields H up to 45~T reveal that URu₂Si₂ displays behavior that is consistent with quantum criticality at a field near 35~T, where a cascade of novel quantum phases was found at and around the quantum critical point, suggesting the existence of competing order parameters. Experiments at high pressure P reveal that a first order transition from the HO phase to a large moment antiferromagnetic (LMAFM) phase occurs under pressure at a critical pressure Pc. We have recently demonstrated that tuning URu₂Si₂ by substitution of Fe for Ru offers an opportunity to study the HO and LMAFM phases at atmospheric pressure. In this study, we conducted electrical resistance measurements on URu_2-xFe_xSi₂ for H < 65 T using the pulsed field facility at the NHMFL in Los Alamos, in order to establish the temperature T vs. H phase diagram of URu_2-xFe_xSi₂ under magnetic fields.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1345910
• Report Number(s): LA-UR-17-21729
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
High Magnetic Field Science