Observation of the hybridization gap in different ground states of URu2-xFexSi2 and URu2Si2-xPx

ORAL

Abstract

Quasiparticle scattering spectroscopy (QPS) applied to heavy fermions utilizes a ballistic junction to probe how electrons scatter off strongly energy-dependent density of states in the bulk[1]. Our previous QPS study on URu2Si2-xPx[2] found that a hybridization gap opens regardless of the ground state ordering as it was also observed in the no-order region, consistent with earlier reports where a hybridization gap was observed to open well above the hidden order transition temperature in URu2Si2[1]. Fe substitution acts like the application of chemical pressure[3] and the resulting phase diagram closely resembles the case of hydrostatic pressure, providing a new opportunity to probe the coexistent/competing region. We will present conductance spectra as a function of temperature and chemical substitution and discuss the correlation between hybridization process and emergent ground states.
[1] W. K. Park et al. PRL 108, 246403 (2012) [2] A. Gallagher et al. Nat. Commun. 7, 10712 (2016) [3] S. Ran et al. PNAS 113,13348(2016).

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Presenters

  • Shengzhi Zhang

    Florida State University

Authors

  • Shengzhi Zhang

    Florida State University

  • Greta Chappell

    Florida State University, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory and Florida State University

  • Ryan Baumbach

    National High Magnetic Field Laboratory, Florida State University, Florida State University, NHMFL-FSU, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory and Florida State University, National High Magnetic Field Laboratory - Florida State University, NHMFL

  • Naveen Pouse

    Physics, University of California, San Diego, 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

  • Laura H Greene

    Florida State University, Physics, Florida State University, National High Magnetic Field Laboratory, Florida State University

  • Wan Kyu Park

    Florida State University, Physics, Florida State University, National High Magnetic Field Laboratory, Florida State University