Irreversible dynamics of the phase boundary in U(Ru$_{1-x}$Rh$_x$)$_2$Si$_2$

ORAL

Abstract

Specific heat and magneto-caloric effect measuments on the systems: U(Ru$_{1-x}$Rh$_x$)$_2$Si$_2$ and Yb$_{1-x}$Y$_x$In Cu$_4$ were carried out at high magnetic fields. Thermodynamic similarities are found at the phase boundary into the magnetic field-induced phase (phase II) of the former and at the valence transition of the latter. We show that the irreversible properties of the transition into the phase II of U(Ru$_{1-x} $Rh$_x$)$_2$Si$_2$ are very similar to that associated with the valence transition of Yb$_{1-x}$Y$_x$In Cu$_4$. To explain these results, we propose a bootstrap mechanism by which lattice degrees of freedom within phase II become coupled to the 5f-electron hybridization, giving raise to a valence change at the transition.

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Authors

  • Victor Fanelli

    • Dep. of Phys. and Astron., University of California, Irvine, CA and MST-NHMFL, LANL, Los Alamos, NM

  • A.V. Silhanek

  • M. Jaime

  • N. Harrison

    • MST-NHMFL, LANL, Los Alamos, NM

  • C.D. Batista

    • T11, LANL, Los Alamos, NM

  • H. Amitsuka

    • Grad. School of Science, Hokkaido University, Japan

  • L. Balicas

    • NHMFL-FSU, Tallahassee, FL

  • J.L. Sarrao

    • MST, LANL, Los Alamos, NM

  • J.A. Mydosh

    • II Physikalisches Institut, Universitat zu Koln, Germany