Blume-Capel model on cylindrical Ising nanowire with core/shell structure: Existence of a dynamic compensation temperatures

TL;DR

This study investigates the dynamic phase transitions and compensation phenomena in a Blume-Capel model on a cylindrical Ising nanowire with core/shell structure under an oscillating magnetic field, revealing complex phase diagrams and multiple compensation points.

Contribution

It introduces a mean-field dynamical analysis of the Blume-Capel model on nanowires, identifying multiple compensation behaviors and phase diagram features not previously detailed.

Findings

Identification of dynamic phase transition points.

Discovery of multiple compensation temperatures, including W-type behaviors.

Construction of phase diagrams with various magnetic phases.

Abstract

We present a study, within a mean-field approach, of the kinetics of the spin-1 Blume-Capel model on cylindrical Ising nanowire in the presence of a time-dependent oscillating external magnetic field. We employ the Glauber transition rates to construct the mean-field dynamical equations. We investigate the thermal behavior of the dynamic order parameters. From these studies, we obtain the dynamic phase transition (DPT) points. Then, we study the temperature dependence of the dynamic total magnetization to find the dynamic compensation points as well as to determine the type of behavior. We also investigate the effect of a crystal-field interaction and the exchange couplings between the nearest-neighbor pairs of spins on the compensation phenomenon and construct the phase diagrams in four different planes. The dynamic phase diagrams contain paramagnetic (P), ferromagnetic (F), the antiferromagnetic (AF), and two coexistence or mixed phase regions, namely, the F + P and AF + P that strongly depend on interaction parameters. The system also exhibits the compensation temperatures, or the N-, P-, Q-, S- type behaviors. Furthermore, we also observed two compensation temperatures, namely W-type behaviors, which this result is compared with some experimental works and a good overall agreement is found.