Unconventional Anomalous Hall Effect in UCu$_{5}$

ORAL

Abstract

Field-dependent resistivity, magnetization, and specific heat measurements have been carried out on the heavy fermion compound UCu$_{5}$. We find an unconventional anomalous Hall resistance below the lower temperature magnetic transition at T$_{2} \quad \sim $ 1 K that is proportional to neither the magnetization nor the longitudinal resistivity. We discuss the origin of this resistance in terms of the itinerant carriers' interaction with the magnetically ordered U cations. Complementary measurements on Lu$_{1-x}$U$_{x}$Cu$_{5}$, x = 0 to 0.15 show how non-magnetic dilution affects the Hall resistance and magnetic phase diagram. Interestingly, light Lu substitution for U appears to stabilize the low temperature magnetic phase.

*Work at Los Alamos National Laboratory was performed under the auspices of the U.S. Department of Energy, Office of Science and Los Alamos Laboratory Directed Research and Development. Z.F. acknowledges funding from NSF-DMR-0801253.

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Authors

  • B.G. Ueland

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • C.F. Miclea

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • I. Martin

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • E.D. Bauer

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • R. Movshovich

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • F. Ronning

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • Z. Fisk

    • Department of Physics \& Astronomy, University of California, Irvine, California 92697, USA

  • J.D. Thompson

    • Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA