Magnon Bose-Einstein condensation and superconductivity in a frustrated Kondo lattice.

ABSTRACT: Motivated by recent experiments on magnetically frustrated heavy fermion metals, we theoretically study the phase diagram of the Kondo lattice model with a nonmagnetic valence bond solid ground state on a ladder. A similar physical setting may be naturally occurring in [Formula: see text], [Formula: see text], and [Formula: see text] compounds. In the insulating limit, the application of a magnetic field drives a quantum phase transition to an easy-plane antiferromagnet, which is described by a Bose-Einstein condensation of magnons. Using a combination of field theoretical techniques and density matrix renormalization group calculations we demonstrate that in one dimension this transition is stable in the presence of a metallic Fermi sea, and its universality class in the local magnetic re

SUBMITTER: Volkov PA 

PROVIDER: S-EPMC7456097 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature