Exact Solution of the Heinsenberg-Kondo Quantum Spin Glass, Showing that an Infinite Order Quantum Phase Transition Occurs Between the Quantum Spin Glass and Kondo Spin Quenched Phases at a Temperature of Order Ten Times Lower than that Given by Mean Fi

ORAL

Abstract

We have exactly solved the Heisenberg-Kondo model of a quantum spin glass, showing that an infinite order phase transition occurs between the quantum spin glass phase and the Kondo spin quenched phase at a temperature $T_c $ of an order of magnitude smaller than that given by mean field theory, which predicts a fast order phase transition. The phase diagram will be presented as a function of the ratio of the Kondo exchange $J^K$and Heisenberg exchange $J^H$ divided by the Fermion band width $W$.

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Authors

  • Robert Schrieffer

    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310
    • Physics Department and National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32310.
    • National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, FL 32310

  • Bernard Coqblin

    • Laboratoire de Physique des Solides,Université Paris-Sud, 91405, Orsay Cedex, France
    • de Physiques des Solides, CNRS, University Paris-Sud, Orsay, France