Low-lying excitations and magnetization process of coupled tetrahedral systems

TL;DR

This paper studies the low-energy excitations and magnetization behavior of quasi-one-dimensional tetrahedral spin systems, revealing exact excitations and phase transitions including magnetization plateaus.

Contribution

It identifies exact low-lying excitations and characterizes first-order transitions and magnetization plateaus in coupled tetrahedral spin models.

Findings

Exact low-lying singlet and triplet excitations identified

First-order transition between different ground states

Two distinct magnetization plateaus separated by a transition

Abstract

We investigate low-lying singlet and triplet excitations and the magnetization process of quasi-1D spin systems composed of tetrahedral spin clusters. For a class of such models, we found various exact low-lying excitations; some of them are responsible for the first-order transition between two different ground states formed by local singlets. Moreover, we find that there are two different kinds of magnetization plateaus which are separated by a first-order transition.