An Effective Spin Hamiltonian Approach to Metamagnetism - I
Strongly Correlated Electrons
2018-08-20 v1
Abstract
We describe a minimal model, based on a spin only Hamiltonian with a single energy scale for itinerant electron metamagnetism. Within this model the metamagnetic critical field is directly proportional to the temperature where a peak in the linear susceptibility occurs which in turn is related in a simple manner to the temperature where the nonlinear susceptibilities also peak. The spin dependent thermodynamic properties are derived in a straightforward manner and bear a striking resemblance to observations in such strongly correlated systems as heavy fermion materials. We also consider extensions of the model by including effects such as a mean field to encompass observed deviations from a minimal metamagnetic behavior.
Cite
@article{arxiv.1808.05658,
title = {An Effective Spin Hamiltonian Approach to Metamagnetism - I},
author = {P. Kumar and B. S. Shivaram and V. Celli},
journal= {arXiv preprint arXiv:1808.05658},
year = {2018}
}