Field-Induced Transition in the S=1 Antiferromagnetic Chain with Single-Ion Anisotropy in a Transverse Magnetic Field

TL;DR

This study investigates how a transverse magnetic field induces phase transitions in a one-dimensional S=1 antiferromagnetic chain with single-ion anisotropy, revealing unique thermal and magnetic behaviors distinct from longitudinal field effects.

Contribution

It provides a theoretical analysis of field-induced transitions in the S=1 chain using Schwinger boson mean-field theory, highlighting differences under transverse versus longitudinal fields.

Findings

Specific heat anomalies suggest a transition from Luttinger liquid to ordered phase.

Distinct behaviors of susceptibility and specific heat under transverse field.

Proposed phase diagram aligning with experimental data.

Abstract

The field-induced transition in one-dimensional S=1 Heisenberg antiferromagnet with single-ion anisotropy in the presence of a transverse magnetic field is obtained on the basis of the Schwinger boson mean-field theory. The behaviors of the specific heat and susceptibility as functions of temperature as well as the applied transverse field are explored, which are found to be different from the results obtained under a longitudinal field. The anomalies of the specific heat at low temperatures, which might be an indicative of a field-induced transition from a Luttinger liquid phase to an ordered phase, are explicitly uncovered under the transverse field. A schematic phase diagram is proposed. The theoretical results are compared with experimental observations.