Magnetoresistance Near the Quantum Critical Point of BaFe$_2$(As$_{1-x}$P$_x$)$_2$

ORAL

Abstract

We report on the magnetoresistance of the Iron-pnictide superconductor BaFe$_2$(As$_{1-x}$P$_x$)$_2$ up to 65 Tesla. In addition to showing unconventional superconductivity, this compound has a quantum critical point associated with the suppression of the anti-ferromagnetic transition to zero temperature at a x = 0.33. We propose a simple model for the magnetoresistance of a quantum critical system; at the quantum critical point of BaFe$_2$(As$_{1-x}$P$_x$)$_2$ this model captures the data quite well, while significant deviations are observed for samples far from the critical point. I will discuss this analysis in detail, as well as extensions to other systems.

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Authors

  • Ian Hayes

    • Department of Physics, University of California, Berkeley, California 94720

  • Arkady Shekhter

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos NM 87545

  • Ross McDonald

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos NM 87545
    • LANL
    • Los Alamos National Lab
    • National High Magnetic Field Laboratory, Los Alamos National Laboratory

  • Nicholas Breznay

    • Materials Science Division, Lawrence Berkeley National Laboratory, California 94720
    • Lawrence Berkeley National Laboratory

  • James Analytis

    • Department of Physics, University of California, Berkeley, California 94720
    • University of California, Berkeley