Possibility of field-induced incommensurate order in quasi-one-dimensional frustrated spin system

TL;DR

This paper investigates how external magnetic fields induce incommensurate long-range order in a quasi-one-dimensional frustrated spin system, highlighting the role of frustration and pressure effects through detailed phase diagram analysis.

Contribution

It presents a microscopic model analysis revealing the development of field-induced incommensurate order due to frustration in a quasi-1D spin system, including phase diagrams and magnetization features.

Findings

Incommensurate order is induced by magnetic field in the system.

Frustration enhances the incommensurate order and affects phase boundaries.

A magnetization plateau at half saturation is observed.

Abstract

We study an incommensurate long-range order induced by an external magnetic field in a quasi-one-dimensional bond-alternating spin system, F5PNN, focusing on the role of the frustrating interaction which can be enhanced by a high-pressure effect. On the basis of the density matrix renormalization group analysis of a microscopic model for F5PNN, we present several H-T phase diagrams for typical parameters of the frustrating next-nearest-neighbour coupling and the interchain interaction, and then discuss how the field-induced incommensurate order develops by the frustration effect in such phase diagrams. A magnetization plateau at half the saturation moment is also mentioned.