Exploring "hidden order" (HO) through Re and Rh co-substitution in URu2Si2

POSTER

Abstract

The identity of the mysterious “hidden-order” (HO) phase in the correlated f-electron superconductor (SC) URu2Si2 has eluded researchers for more than three decades. Substitution of transition metals into URu2Si2 at the Ru sites reveals how factors such as lattice parameters, charge carrier concentration, disorder and d-f electron hybridization influence the HO phase and SC. We discuss the effects of the co-substitution of equal amounts of Re and Rh, which are isoelectronic on average, into URu2Si2 to form URu2-2xRexRhxSi2, pseudo ternary alloys based on the physical properties including structure and lattice parameters, electrical resistivity, magnetic susceptibility, and specific heat. The features in the physical properties that characterize the energy gap associated with the HO phase (e.g., exponential T-dependence of the specific heat) are suppressed rapidly with Re and Rh co-substitution level so that by x = 0.11, the HO phase transition is no longer discernible. The HO phase transition temperature (THO) and the gap decrease monotonically with Re-Rh concentration x.

Presenters

  • Kalyan Sasmal

    University of California, San Diego, Department of Physics, University of California, San Diego, La Jolla, CA 92093, Department of Physics, University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA

Authors

  • Kalyan Sasmal

    University of California, San Diego, Department of Physics, University of California, San Diego, La Jolla, CA 92093, Department of Physics, University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA

  • Sheng Ran

    University of Maryland, College Park, Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland

  • Trevor Keiber

    University of California, San Diego

  • Bob Wang

    University of California, San Diego

  • Robert A Robinson

    University of California, San Diego

  • M Brian Maple

    University of California, San Diego, Department of Physics, University of California, San Diego, La Jolla, CA 92093, Department of Physics, University of California, San Diego, UC San Diego, Physics, University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA, Physics, University of California, SanDiego