Feasibility of a metamagnetic transition in correlated systems
Abstract
The long-standing issue of the competition between the magnetic field and the Kondo effect, favoring, respectively, triplet and singlet ground states is addressed using a cluster slave-rotor mean field theory for the Hubbard model and its spin-correlated, spin-frustrated extensions in 2 dimension. The metamagnetic jump is established and compared with earlier results of dynamical mean-field theory. The present approach also reproduces the emergent super-exchange energy scale in the insulating side. A scaling is found for the critical Zeeman field in terms of the intrinsic coherence scale just below the metal-insulator transition where the critical spin fluctuations are soft. The conditions for metamagnetism to appear at a reasonable field are also underlined. The Gutzwiller analysis on the 2D Hubbard model and a quantum Monte Carlo calculation on the Heisenberg spin system are performed to check the limiting cases of the cluster slave-rotor results for the Hubbard model. Low-field scaling features for magnetization are discussed.
Keywords
Cite
@article{arxiv.1411.7335,
title = {Feasibility of a metamagnetic transition in correlated systems},
author = {Swagata Acharya and Amal Medhi and N. S. Vidhyadhiraja and A. Taraphder},
journal= {arXiv preprint arXiv:1411.7335},
year = {2016}
}
Comments
arxiv version has 8 pages and 7 figures