Magnetization Plateau of the Distorted Diamond Spin Chain with Anisotropic Ferromagnetic Interaction

TL;DR

This paper investigates how anisotropic ferromagnetic interactions affect the magnetization plateau at 1/3 saturation in a distorted diamond spin chain, revealing a quantum phase transition between different plateau mechanisms.

Contribution

It introduces a detailed phase diagram showing the transition between two plateau mechanisms driven by anisotropy and ferromagnetic coupling variations.

Findings

Quantum phase transition occurs between two plateau mechanisms.

Phase diagram maps anisotropy and ferromagnetic coupling effects.

Magnetization plateau persists at 1/3 saturation across parameters.

Abstract

The $S=1/2$ distorted diamond spin chain with the anisotropic ferromagnetic interaction is investigated using the numerical diagonalization and the level spectroscopy analysis. It is known that the system exhibits a plateau of the magnetization curve at the 1/3 of the saturation. The present study indicates that as the anisotropy is varied the quantum phase transition occurs between two different mechanisms of the 1/3 magnetization plateau. The phase diagram with respect to the anisotropy and the ferromagnetic coupling is also presented.