Linear magnetoresistance of hetroepitaxial thin films of pyrochlore iridates Bi$_2$Ir$_2$O$_7$

ORAL

Abstract

We report on the discovery of linear magnetoresistance in hetroepitaxial thin films of the pyrochlore iridates Bi$_2$Ir$_2$O$_7$. The magnetoresistance of Bi$_2$Ir$_2$O$_7$ shows a highly isotropic, linear field dependence at T = 1.6K, but gradually evolves towards a quadratic field dependence as temperature increases. By interfacing the Bi$_2$Ir$_2$O$_7$ with pyrochlore spin ice compound Dy$_2$Ti$_2$O$_7$, the magnetoresistance at sub-kelvin temperatures shows pronounce anisotropy with a complex field dependence. We argued that these unusual magnetotransport behaviors cannot be explained by disorder induced quantum correction, but might be related to the magnetism of Bi$_2$Ir$_2$O$_7$.

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Authors

  • Jiun-Haw Chu

    • Materials Science Division, Lawrence Berkeley National Laboratory

  • Scott Riggs

    • Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford

  • Maxwell Shapiro

    • Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford

  • Jian Liu

    • Materials Science Division, Lawrence Berkeley National Laboratory

  • Claudy Ryan Serero

    • Department of Materials Science and Engineering, University of California, Berkeley,

  • Di Yi

    • Department of Materials Science and Engineering, University of California, Berkeley,

  • Matthew Melissa

    • Department of Physics, University of California, Berkeley

  • S.J. Suresha

    • Materials Science Division, Lawrence Berkeley National Laboratory

  • Carlos Frontera

    • Institut de Ciencia de Materials de Barcelona, ICMAB-CSIC

  • Ashvin Vishwanath

    • Department of Physics, University of California, Berkeley

  • Xavi Marti

    • Department of Materials Science and Engineering, University of California, Berkeley,

  • Ian Fisher

    • Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford

  • R. Ramesh

    • Materials Science Division, Lawrence Berkeley National Laboratory