Observation of the hybridization gap in different ground states of URu<sub>2-x</sub>Fe<sub>x</sub>Si<sub>2</sub> and URu<sub>2</sub>Si<sub>2-x</sub>P<sub>x</sub>

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).

*NHMFL and GC is supported by NSF/DMR-1644779,1157490 and the State of Florida.SZ by the CES, a DOE EFRC under Award DE-AC0298CH1088 and the NSF/DMR 17-04712.WKP and LHG by the NSF DMR 17-04712.RB by the NSF/DMR 11-57490.NP and MBM by DOE DE-FG02-04ER46105

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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