Large tunable anomalous Hall effect in the kagome antiferromagnet U₃Ru₄Al₁₂

Journal Article · Thu Jul 16 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.035127· OSTI ID:1673366

Asaba, T.  ^[1]; Su, Ying  ^[1]; Janoschek, M.  ^[2]; Thompson, J. D.  ^[1]; Thomas, S. M.  ^[1]; Bauer, E. D.  ^[1]; Lin, Shi-Zeng  ^[1]; Ronning, F.  ^[3]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Paul Scherrer Inst., Villigen (Switzerland). Lab. for Neutron and Muon Instrumentation
3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Inst. for Materials Science

The Berry curvature in magnetic systems is attracting interest due to the potential tunability of topological features via the magnetic structure. $f$ electrons, with their large spin-orbit coupling, abundance of noncollinear magnetic structures, and high electronic tunability, are attractive candidates to search for tunable topological properties. In this study, we measure anomalous Hall effect (AHE) in the distorted kagome heavy fermion antiferromagnet ${\mathrm{U}}_3{\mathrm{Ru}}_4{\mathrm{Al}}_{12}$. Furthermore, a large intrinsic AHE in high fields reveals the presence of a large Berry curvature. Moreover, the fields required to obtain the large Berry curvature are significantly different between $B\parallel a$ and $B\parallel a^{*}$, providing a mechanism to control the topological response in this system. Theoretical calculations illustrate that this sensitivity may be due to the heavy fermion character of the electronic structure. These results shed light on the Berry curvature of a strongly correlated band structure in magnetically frustrated heavy fermion materials but also emphasize $5f$ electrons as an ideal playground for studying field-tuned topological states.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
• Grant/Contract Number: 89233218CNA000001; AC52-06NA25396; DMR-16447
• OSTI ID: 1673366
• Report Number(s): LA-UR-19-25889; TRN: US2204207
• Journal Information: Physical Review B, Vol. 102, Issue 3; ISSN 2469-9950
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Anomalous Hall effect
antiferromagnetism
heavy-fermion systems
Kagome lattics
topological materials