Monte Carlo study of phase separation in magnetic insulators

Abstract

In this work we focus on the study of phase separation in the zero-bandwidth extended Hubbard with nearest-neighbors intersite Ising-like magnetic interactions $J$ and on-site Coulomb interactions $U$. The system has been analyzed by means of Monte Carlo simulations (in the grand canonical ensemble) on two dimensional square lattice (with $N=L\times L=400$ sites) and the results for $U/(4J)=2$ as a function of chemical potential and electron concentration have been obtained. Depending on the values of interaction parameters the system exhibits homogeneous (anti-)ferromagnetic (AF) or non-ordered (NO) phase as well as phase separation PS:AF/NO state. Transitions between homogeneous phases (i.e. AF-NO transitions) can be of first or second order and the tricritical point is also present on the phase diagrams. The electron compressibility $K$ is an indicator of the phase separation and that quantity is of particular interest of this paper.

4 pages, 3 figures; pdf-ReVTeX; updated references; presented at The European Conference PHYSICS OF MAGNETISM 2014 (PM'14), June 23-27, 2014, Poznan, Poland; submitted to Acta Physica Polonica A

References in corpus (4)

• Striped superconductors: How the cuprates intertwine spin, charge and superconducting orders
• Charge orderings in the atomic limit of the extended Hubbard model
• Triplet superconductivity in a 1D itinerant electron system with transverse spin anisotropy
• Some exact results for the zero-bandwidth extended Hubbard model with intersite charge and magnetic interactions

Cited by in corpus (3)

• Some exact results for the zero-bandwidth extended Hubbard model with intersite charge and magnetic interactions
• Magnetic and charge orders on the triangular lattice: Extended Hubbard model with intersite Ising-like magnetic interactions in the atomic limit
• Localized fermions on the triangular lattice with Ising-like interactions