Characterization of multiple phases in URu<sub>2-x</sub><i>M</i><sub>x</sub>Si<sub>2 </sub>for <i>M</i> = 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.

*We acknowledge funding from the NSF (DMR 1206553) and the DOE ( DEFG02-04-ER46105).

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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