Characterization of multiple phases in URu2-xMxSi2 for M = Co, Ir

ORAL

Abstract

The heavy-fermion compoundURu2Si2 was substituted with M = Co and Ir to form polycrystalline samples of the pseudo-ternary system URu2-xMxSi2. Phase diagrams are presented based on electrical resistivity, magnetization, specific heat, and x-ray diffraction measurements. Substitution with M = Co and Ir suppresses the hidden order features by x = 0.1, after which, no ordering is observed for 0.1 < x < 0.3. For M = Ir, an antiferromagnetic phase (AFM-1) gradually emerges with a Néel temperature (TN1) that increases from TN1 = 28 to 40 K over the region 0.3 < x < 0.5. At x = 0.5, the AFM-1 phase separates into three distinct peaks, each of which persists with little temperature change until x = 1.0. For higher x, there is again a region with no ordered phase, which persists until a structural phase transition occurs at x = 1.35. For M = Co, an AFM-2 phase emerges at x = 1.0 with TN2 = 80 (5) K; the phase boundary varies with x reaching a maximum of TN2 = 106 (5) K. The results of this study are compared with previous studies for M = Rh, Fe, Os, Re, and P in the context of electron doping, the chemical pressure, and structural disorder.

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Presenters

  • Trevor Keiber

    Physics, University of California, San Diego

Authors

  • Trevor Keiber

    Physics, University of California, San Diego

  • Sheng Ran

    Department of Physics, University of California, San Diego, Univ of California - San Diego, Physics, University of California, San Diego, Department of Physics, Univeristy of Maryland, Department of Physics, University of Maryland

  • Kalyan Sasmal

    Department of Physics, University of California, San Diego, Physics, University of California, San Diego, Physics, Univ of California - San Diego

  • Christian Wolowiec

    Department of Physics, University of California, San Diego, Physics, University of California, San Diego, Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, Physics, Univ of California - San Diego

  • Inho Jeon

    University of California, San Diego, Physics, University of California, San Diego, Department of Physics, University of California, San Diego, Materials Science and Engineering, University of California, San Diego, Materials Science and Engineering Program and Center for Advanced Nanoscience, University of California, San Diego, Materials Science and Engineering Program, and Center for Advanced Nanoscience, Univ of California - San Diego, Materials Science and Engineering Program, Univ of California - San Diego, University of California-San Diego

  • Noravee Kanchanavatee

    Physics, University of California, San Diego, Department of Physics, University of California, San Diego, Department of Physics and Center for Advanced Nanoscience, University of California, San Diego

  • Robert Robinson

    Physics, University of California, San Diego, Department of Physics, University of California, San Diego

  • Bob Wang

    Physics, University of California, San Diego, Department of Physics, University of California, San Diego

  • M Brian Maple

    Department of Physics, University of California, San Diego, University of California, San Diego, Physics, University of California, San Diego, Univ of California - San Diego, Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, Department of Physics, Center for Advanced Nanoscience,Materials Science and Engineering Program , Univ of California - San Diego, Department of Physics, University of California San Diego, Physics, Univ of California - San Diego, University of California-San Diego, UC San Diego, Physics, UC San Diego