Transport and thermoelectric properties of U3As4
ORAL
Abstract
The discovery of materials with exceptionally large Anomalous Hall Angle (AHA) is both
of fundamental interest and technological use, because large AHA is one measure of a large Berry
curvature associated with nontrivial band topology, which may enable efficient charge-
to-spin conversion, enhanced Hall sensor sensitivity, and low-dissipation transport. Uranium
compounds are promising candidates for realizing such responses due to their correlated 5f
electrons and strong spin–orbit coupling, yet systematic studies remain
limited. Here, we report on those properties of the uranium-based ferromagnet U₃As₄, a body-
centered cubic compound with a Curie temperature of 198 K and heavy-fermion character (γ =
83 mJ/K²·mol). Remarkably, U₃As₄ exhibits a giant anomalous Hall angle of more than 40%,
among the largest reported in ferromagnets, and an anomalous Hall conductivity comparable to
Co2MnGa and surpassing many topological ferromagnets. The interplay of correlated 5f states,
strong spin–orbit coupling, and possible topological band features likely drives these exceptional
responses, indicating that U₃As₄ is a fertile platform for exploring topological heavy-fermion
physics and advancing spintronic and thermoelectric applications.
of fundamental interest and technological use, because large AHA is one measure of a large Berry
curvature associated with nontrivial band topology, which may enable efficient charge-
to-spin conversion, enhanced Hall sensor sensitivity, and low-dissipation transport. Uranium
compounds are promising candidates for realizing such responses due to their correlated 5f
electrons and strong spin–orbit coupling, yet systematic studies remain
limited. Here, we report on those properties of the uranium-based ferromagnet U₃As₄, a body-
centered cubic compound with a Curie temperature of 198 K and heavy-fermion character (γ =
83 mJ/K²·mol). Remarkably, U₃As₄ exhibits a giant anomalous Hall angle of more than 40%,
among the largest reported in ferromagnets, and an anomalous Hall conductivity comparable to
Co2MnGa and surpassing many topological ferromagnets. The interplay of correlated 5f states,
strong spin–orbit coupling, and possible topological band features likely drives these exceptional
responses, indicating that U₃As₄ is a fertile platform for exploring topological heavy-fermion
physics and advancing spintronic and thermoelectric applications.
*A part of this work was performed at Los Alamos National Laboratory under the auspices of the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering.
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Presenters
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Andrew AbdelMalak
- University of Virginia