Exploring Hidden Order through Co and Ir substitution in URu<sub>2</sub>Si<sub>2</sub>

ORAL

Abstract

Hidden-order (HO) phase in heavy-fermion superconductor (SC) is an intriguing phenomena. Doping URu2Si2 at the Ru sites reveals how factors such as lattice constants, charge carriers, disorder and d- f- electron hybridization influence the HO phase and SC. The effects of M = Co, Ir substitution in URu2-xMxSi2 for low concentrations of x, are interpreted from x-ray diffraction, resistivity, DC magnetic susceptibility, and specific heat measurements. The features from physical property measurements which characterize the gapping of HO phase become vanishingly small with substitution, so that by x = 0.09 the HO phase is not discernible. For Co substitution, the HO and SC phase transition temperatures (THO and TSC) both decrease monotonically with concentration. With Ir, there is a much smaller suppression of TSC, and a non-monotonic evolution of THO with x. The results for M = Co, Ir indicative of a parasitic AFM phase, which has been shown to emerge in the HO region for Rh substitution are discussed. We compare THO, TSC, lattice constants and the magnitude of the HO feature of Co and Ir with reported M = Rh, P, Fe and Re. Our study offer a new insight into various intriguing ordered phases.

*This work is supported by US DOE Grant No. DEFG02-04-ER46105 and NSF Grant No. DMR 1206553.

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Presenters

  • Kalyan Sasmal

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

Authors

  • Kalyan Sasmal

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

  • Trevor Keiber

    • Department of 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

  • 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

  • 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

  • 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

  • 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