The effect of pressure and chemical substitution on the ordered phases in the URu2-xMxSi2 (M = Fe, Os) systems

ORAL

Abstract

We investigated the effect of applied pressure and chemical substitution on the hidden order (HO) and antiferromagnetic (AFM) phases in URu2Si2 and report electrical resistivity measurements of single crystals of URu2−xMxSi2 (M = Fe, Os) under pressure. A transition from the HO phase to the AFM phase in URu2Si2 occurs at a critical pressure of 1.5 GPa. The AFM phase is also induced upon substitution of Fe or Os ions for Ru at ambient pressure. We observed that as x is increased in URu2−xFexSi2, less external pressure is required to induce the AFM phase. This is explained by the reduction in unit cell volume owing to the substitution of smaller Fe ions for Ru, which may be interpreted as a chemical pressure. We also observed that as y is increased in URu2−yOsySi2, less external pressure is required to induce the AFM phase. This is contrary to the expectation that larger pressures would be required to induce the AFM phase in a system biased with a negative chemical pressure owing to the substitution of larger Os ions for Ru. This suggests that effects other than volume change may be responsible for the HO to AFM transition.

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Presenters

  • 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

Authors

  • 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

  • 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

  • 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

  • Naveen Pouse

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

  • Kevin Huang

    National High Magnetic Field Lab, Florida State University, NHMFL, Natl High Magnetic Field Lab, NHMFL at Florida State University, National HIgh Magnetic Field Lab at Florida State University, National High Magnetic Field Lab at Florida State University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University

  • 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