Field-induced magnetic behavior in quasi-one-dimensional Ising-like antiferromagnet BaCo2V2O8: A single-crystal neutron diffraction study

TL;DR

This study maps the magnetic phase diagram of BaCo2V2O8 under magnetic fields using neutron diffraction, revealing phase transitions and critical behavior in a quasi-one-dimensional quantum spin system.

Contribution

It provides a detailed experimental phase diagram and critical exponents for BaCo2V2O8, testing theoretical models of Tomonaga-Luttinger liquid physics.

Findings

Transition from Néel to LSDW phase via first-order transition

Determination of critical exponents for phase transitions

Magnetic order characterization in different phases

Abstract

BaCo2V2O8 is a nice example of a quasi-one-dimensional quantum spin system that can be described in terms of Tomonaga-Luttinger liquid physics. This is explored in the present study where the magnetic field-temperature phase diagram is thoroughly established up to 12 T using single-crystal neutron diffraction. The transition from the N\'eel phase to the incommensurate longitudinal spin density wave (LSDW) phase through a first-order transition, as well as the critical exponents associated with the paramagnetic to ordered phase transitions, and the magnetic order both in the N\'eel and in the LSDW phase are determined, thus providing a stringent test for the theory.