Hidden order signatures in the antiferromagnetic phases of URu2Si2 under chemical and hydrostatic pressure

ORAL · Invited

Abstract

URu2Si2 has been an intense area of study for the last 30 years due to a mysterious “hidden order” phase that appears below T0 = 17.5 K. The hidden order phase has been shown to be extremely sensitive to perturbations, being destroyed quickly by the application of a magnetic field, hydrostatic or uniaxial pressure, and chemical doping. While attempting to understand the properties of URu2Si2, neutron scattering has found spin correlations that are intimately related to this hidden order phase and which are also suppressed with these perturbations. Here, I will outline some recent neutron scattering work to study these correlations in two exceptional cases where the hidden order phase is enhanced: hydrostatic pressure and chemical pressure using Fe- and Os-doping. In both of these cases, T0 increases before an antiferromagnetic phase emerges. By performing a careful analysis of the neutron data, we show that these two phases are much more related than had been previously appreciated, with "signature" excitations of the hidden order phase appearing in the antiferromagnetic phases. This implies that the hidden order is likely compatible with an antiferromagnetic ground state, placing constraints on the nature of the missing order parameter.

–

Presenters

  • Travis Williams

    Oak Ridge National Laboratory

Authors

  • Travis Williams

    Oak Ridge National Laboratory

  • Adam Aczel

    Oak Ridge National Laboratory, Oak Ridge National Lab

  • Collin Broholm

    Johns Hopkins University, Institute for Quantum Matter, Johns Hopkins University

  • William Buyers

    Chalk River Laboratories

  • Graeme Luke

    McMaster University, Physics and Astronomy, McMaster University, Department of Physics and Astronomy, McMaster Univ, Department of Physics and Astronomy, McMaster University, Physics and Astronomy, McMaster Univ, MacMaster University, Physics, McMaster University, McMaster Univ

  • Jose Rodriguez

    NIST, NIST Center for Neutron research, NCNR, NIST, NIST NCNR, NIST Center for Neutron Research

  • Matthew Stone

    Oak Ridge National Laboratory, Oak Ridge National Lab, Oak Ridge National Laborator, Neutron scattering devision, Oak Ridge National Lab

  • Murray Wilson

    McMaster University, Physics and Astronomy, McMaster University, Department of Physics and Astronomy, McMaster Univ, Physics and Atmospheric Science, Dalhousie University

  • Zahra Yamani

    Chalk River Laboratories, Chalk River National Laboratory