Magnetic Anisotropy of a Three-Dimensional Honeycomb Iridate

ORAL

Abstract

We present the magnetic anisotropy of a 3-dimensional honeycomb iridate, where the large spin-orbit coupling of iridium provides the possibility for exotic magnetic ground states. A complete angular dependence of magnetic torque provides evidence for highly spin-anisotropic exchange interactions at low temperature. An extension of these measurements to high magnetic fields shows that the magnetic anisotropy switches sign at 50 T and becomes five times larger than the anisotropy at low fields. The anisotropy continues to increase up to the largest applied fields suggesting the presence of new magnetically ordered states.

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Authors

  • Kimberly Modic

    Los ALamos National Laboratory, Los Alamos Natl Lab

  • Ross McDonald

    Los ALamos National Laboratory, Los Alamos Natl Lab, National High Magnetic Field Lab, Los Alamos, MS-E536, NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

  • Arkady Shekter

    Los Alamos Natl Lab

  • James Analytis

    UC Berkeley

  • Brad Ramshaw

    Los Alamos Natl Lab, MS-E536, NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545