The quantum ferromagnetic transition in a clean Kondo lattice is discontinuous
arXiv:1603.07973 · doi:10.1002/prop.201600028
Abstract
The Kondo-lattice model, which couples a lattice of localized magnetic moments to conduction electrons, is often used to describe heavy-fermion systems. Because of the interplay between Kondo physics and magnetic order it displays very complex behavior and is notoriously hard to solve. The ferromagnetic Kondo-lattice model, with a ferromagnetic coupling between the local moments, describes a phase transition from a paramagnetic phase to a ferromagnetic one as a function of either temperature or the ferromagnetic local-moment coupling. At zero temperature, this is a quantum phase transition that has received considerable attention. It has been theoretically described to be continuous, or second order. Here we show that this belief is mistaken; in the absence of quenched disorder the quantum phase transition is first order, in agreement with experiments, as is the corresponding transition in other metallic ferromagnets.
8pp., 2 figs., contribution to FQMT'15
References in corpus (11)
- Quantum Criticality in Heavy Fermion Metals
- Multiple quantum phase transitions in a heavy fermion antiferromagnet
- Fermi surface reconstruction and multiple quantum phase transitions in the antiferromagnet CeRhIn
- Mean Field study of the heavy fermion metamagnetic transition
- Properties of Ferromagnetic Superconductors
- Disorder dependence of the ferromagnetic quantum phase transition
- Quantum critical behavior in heavy electron materials
- Pre-asymptotic critical behavior and effective exponents in disordered metallic quantum ferromagnets
- Third law of thermodynamics and the shape of the phase diagram for systems with a first-order quantum phase transition
- Nonanalyticities in a Strongly Correlated Fermi Liquid: Corrections to Scaling at the Fermi-Liquid Fixed Point
- Pseudofermion ferromagnetism in the Kondo lattices: a mean-field approach