Global phase diagram of heavy fermion metals: Insights from an Ising-anisotropic Kondo lattice model tuned by a transverse magnetic field

ORAL

Abstract

Quantum criticality in heavy fermion metals involves the interplay between quantum fluctuations within the local moments and those associated with the Kondo interaction. The resulting global phase diagram [1,2] has provided a means to categorize heavy-fermion quantum critical points [3] and motivated the study of materials with tunable quantum fluctuations [4]. It can be theoretically characterized within an Extended Dynamical Mean-Field Theory (EDMFT). Towards this goal, we studied an Ising-anisotropic Bose-Fermi Kondo model with a local transverse field [2]. We found a line of critical points separating a Kondo screened phase and a local moment phase. We present preliminary results for the EDMFT study of an Ising-anisotropic Kondo lattice model tuned by a transverse magnetic field. In addition, we discuss the implications of the line of critical points for the global phase diagram.\\[4pt] [1] Q. Si, Phys. Status Solidi B247, 476 (2010); Physica B378, 23 (2006) [2] E.M. Nica et al, PRB 88, 014414 (2013) [3] S. Friedemann et al, Nat. Phys. 5, 465 (2009). [4] J. Custers et al, Nat. Mater. 11, 189 (2012); M. S. Kim {\&} M. C. Aronson, PRL 110, 017201 (2013); V. Fritsch et al, arXiv:1301.6062.

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Authors

  • Emilian Nica

    Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA, Department of Physics and Astronomy, Rice University, Houston 77005

  • Lili Deng

    Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611, USA, Department of Physics, University of Florida

  • Kevin Ingersent

    Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611, USA, University of Florida

  • Jian-Xin Zhu

    Los Alamos National Laboratory, Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA, Theoretical Division and Center for Integrated Technologies, Los Alamos National Laboratory, Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, Los Alamos National Lab, Theoretical Division and Center for Nonlinear Studies, LANL, Los Alamos, New Mexico 87545, USA, Los Alamos Natl Lab

  • Qimiao Si

    Rice University, Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA, Physics \& Astronomy Department, Rice University, Department of Physics and Astronomy, Rice University, Department of Physics and Astronomy, Rice University, Houston 77005