Hexagonal type Ising nanowire with spin-1 core and spin-2 shell structure

TL;DR

This study investigates the thermodynamic properties and phase transitions of a mixed spin-(1, 2) Ising nanowire with a hexagonal structure, revealing complex phase behavior including first- and second-order transitions and tricritical points.

Contribution

It introduces a detailed analysis of phase diagrams and thermodynamic phenomena in a novel hexagonal nanowire Ising system with spin-1 core and spin-2 shell using effective-field theory.

Findings

Identification of first- and second-order phase transitions.

Discovery of tricritical points in the phase diagrams.

Existence of first-order transitions at negative single-ion anisotropies.

Abstract

}Thermodynamic properties and phase diagrams of a mixed spin-(1, 2) Ising ferrimagnetic system with single ion anisotropy on hexagonal nanowire are studied by using effective-field theory with correlations. The susceptibility, internal energy and specific heat of the system are numerically examined and some interesting phenomena in these quantities are found. The effect of the Hamiltonian parameters on phase diagrams are examined in detail. Besides second-order phase transition, lines of first-order transition and tricritical points are found. In particular, we found that for some negative values of single-ion anisotropies, there exist first-order phase transitions.