Translational Symmetry Broken Magnetization Plateau of the $S={{1}\over{2}}$ Anisotropic Spin Ladder with Ferromagnetic Rung Interaction

TL;DR

This paper investigates the magnetization process of an anisotropic spin ladder with ferromagnetic rungs, revealing a translational symmetry broken magnetization plateau at half saturation under strong anisotropies.

Contribution

It introduces the discovery of a translational symmetry broken magnetization plateau in the $S=1/2$ anisotropic spin ladder with ferromagnetic rung interaction, supported by numerical diagonalization.

Findings

Plateau appears at half saturation magnetization.

Plateau occurs under large anisotropies.

Phase diagram with anisotropies and magnetization curves provided.

Abstract

The magnetization process of the $S=1/2$ anisotropic spin ladder with the ferromagnetic rung interaction is investigated using the numerical diagonalization of finite-size clusters. It is found that the translational symmetry broken magnetization plateau would appear at half the saturation magnetization, when the competing anisotropies are sufficiently large. The phase diagram with respect to the anisotropies and several magnetization curves are presented.