Conventional and rotating magnetoelectric effect of a half-filled spin-electron model on a doubly decorated square lattice

TL;DR

This paper investigates the conventional and rotating magnetoelectric effects in a half-filled spin-electron model on a doubly decorated square lattice, highlighting the influence of electron hopping, electric field orientation, and temperature on magnetic ordering.

Contribution

It provides exact calculations of the magnetoelectric effects, emphasizing the role of electric field orientation and strength, and reveals the impact of rotating magnetoelectric effect near phase transition temperatures.

Findings

Critical temperature can show one or two maxima with electric field.

Rotating magnetoelectric effect is pronounced near critical temperature.

Electric field strengthens RME and disrupts antiferromagnetic order.

Abstract

A conventional and rotating magnetoelectric effect of a half-filled spin-electron model on a doubly decorated square lattice is investigated by exact calculations. An importance of the electron hopping and spatial orientation of the electric field upon a magnetoelectric effect is examined in detail. A critical temperature may display one or two consecutive round maxima as a function of the electric field. Although the rotating magnetoelectric effect (RME) does not affect the ground-state ordering, the pronounced RME is found close to a critical temperature of continuous phase transition. It is shown that RME is amplified upon strengthening of the electric field, which additionally supports thermal fluctuations in destroying a spontaneous antiferromagnetic long-range order.