Magnetization Plateau of the Distorted Diamond Spin Chain

TL;DR

This study investigates the magnetization behavior of a distorted diamond spin chain, revealing the disappearance of the 1/3 plateau at high XY-like anisotropy and mapping the phase diagram using numerical methods.

Contribution

It provides new insights into how anisotropy affects the magnetization plateau and offers a detailed phase diagram for the frustrated quantum spin system.

Findings

1/3 magnetization plateau vanishes at high XY anisotropy

Phase diagram constructed via level spectroscopy

Numerical diagonalization confirms previous mechanisms

Abstract

The frustrated quantum spin system on the distorted diamond chain lattice is investigated using the numerical diagonalization of finite-size clusters and the level spectroscopy analysis. In the previous work this system was revealed to exhibit the 1/3 magnetization plateau due to two different mechanisms depending on the coupling parameters, and the phase diagram at the 1/3 magnetization was obtained. In the present work it is found that the 1/3 magnetization plateau vanishes for sufficiently large $XY$-like coupling anisotropy. The phase diagram based on the level spectroscopy analysis is also presented.