Longitudinal SDW order in a quasi-1D Ising-like quantum antiferromagnet

TL;DR

This paper reports the discovery of a novel incommensurate magnetic order in a quasi-1D Ising-like quantum antiferromagnet, driven by quantum fluctuations and related to Tomonaga-Luttinger liquid behavior.

Contribution

It presents experimental evidence of a new incommensurate magnetic order caused by quantum fluctuations in a quasi-1D Ising-like system, highlighting TLL physics.

Findings

Observation of incommensurate magnetic order in BaCo₂V₂O₈

Order differs from classical Néel-type due to quantum effects

Quantum fluctuations induce novel magnetic phases

Abstract

From neutron diffraction measurements on a quasi-1D Ising-like Co$^{\rm 2+}$ spin compound BaCo$_{\rm 2}$V$_{\rm 2}$O$_{\rm 8}$, we observed an appearance of a novel type of incommensurate ordering in magnetic fields. This ordering is essentially different from the N{\' e}el-type ordering, which is expected for the classical system, and is caused by quantum fluctuation inherent in the quantum spin chain. A Tomonaga-Luttinger liquid (TLL) nature characteristic of the gapless quantum 1D system is responsible for the realization of the incommensurate ordering.