High magnetic field thermal-expansion and magnetostriction of URu$_2$Si$_2$

ORAL

Abstract

We present high magnetic field (up to 45 T) thermal-expansion and magnetostriction results on URu$_2$Si$_2$ single crystals. The volume change associated with the transition to the ``hidden'' order phase becomes increasingly discontinous as the magnetic field is raised above 30 T. This confirms recent thermal conductivity and specific heat experiments indicating a strong coupling between the ``hidden'' order parameter and the lattice which suggest some sort of charge ordered state. Several other transitions are observed at higher fields, many of them showing hysteresis, while a change in the sign of the magnetostriction coefficient is observed at the metamagnetic transition ($B_M$ $\sim$ 38 T).

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Authors

  • V\'ictor Correa

  • Timothy Murphy

  • Eric Palm

  • Stanley Tozer

    • NHMFL-FSU
    • National High Magnetic Field Laboratory, FSU, Tallahassee, FL
    • National High Magnetic Field Laboratory, Florida State University

  • Peter Sharma

    • NHMFL, Los Alamos National Laboratory
    • National High Magnetic Field Laboratory-LANL

  • Neil Harrison

  • Marcelo Jaime

    • NHMFL-LANL
    • National High Magnetic Field Laboratory, Los Alamos National Laboratory

  • George Schmiedeshoff

    • Occidental College

  • John Mydosh

    • II Physikalisches Institut, Universit\"at zu K\"oln