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

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.