Monte Carlo Simulations of the site-diluted 3d XY model with superexchange interaction: application to Fe[Se$_2$CN(C$_2$H$_5$)$_2$]$_2$Cl -- Zn[S$_2$CN(C$_2$H$_5$)$_2$]$_2$ diluted magnets

J. B. Santos-Filho; J. A. Plascak

paper

Monte Carlo Simulations of the site-diluted 3d XY model with superexchange interaction: application to Fe[Se $_{2}$ CN(C $_{2}$ H $_{5}$ ) $_{2}$ ] $_{2}$ Cl -- Zn[S $_{2}$ CN(C $_{2}$ H $_{5}$ ) $_{2}$ ] $_{2}$ diluted magnets

arXiv:1509.08121

Abstract

A simple site-diluted classical XY model is proposed to study the magnetic properties of the ferromagnetic polycrystalline Fe[Se $_{2}$ CN(C $_{2}$ H $_{5}$ ) $_{2}$ ] $_{2}$ Cl diluted with diamagnetic Zn[S $_{2}$ CN(C $_{2}$ H $_{5}$ ) $_{2}$ ] $_{2}$ . An extra superexchange interaction is assumed between next-nearest-neighbors on a simple cubic lattice, which are induced by a diluted ion. The critical properties are obtained by Monte Carlo simulations using a hybrid algorithm, single histograms procedures and finite-size scaling techniques. Quite good fits to the experimental results of the ordering temperature are obtained, namely its much less rapidly decreasing with dilution than predicted by the standard diluted 3 $d$ XY model, and the change in curvature around $86%$ of the magnetic Fe[Se $_{2}$ CN(C $_{2}$ H $_{5}$ ) $_{2}$ ] $_{2}$ Cl compound.

Monte Carlo Simulations of the site-diluted 3d XY model with superexchange interaction: application to Fe[Se2​CN(C2​H5​)2​]2​Cl -- Zn[S2​CN(C2​H5​)2​]2​ diluted magnets

Abstract

Monte Carlo Simulations of the site-diluted 3d XY model with superexchange interaction: application to Fe[Se $_{2}$ CN(C $_{2}$ H $_{5}$ ) $_{2}$ ] $_{2}$ Cl -- Zn[S $_{2}$ CN(C $_{2}$ H $_{5}$ ) $_{2}$ ] $_{2}$ diluted magnets