Experimental realization of field-induced XY and Ising ground states in a quasi-2D S=1/2 Heisenberg antiferromagnet

TL;DR

This study demonstrates the induction of XY and Ising magnetic ground states in a quasi-2D S=1/2 Heisenberg antiferromagnet through high magnetic fields, revealing field-dependent anisotropic magnetic ordering.

Contribution

It provides experimental evidence of field-induced XY and Ising ground states in a quasi-2D antiferromagnet, highlighting the role of easy-plane anisotropy.

Findings

Field induces Ising-type order with lambda anomaly in Cp when field is in-plane.

Field induces XY-type antiferromagnetism when field is along the c-axis.

Easy-plane anisotropy enables the coexistence of different magnetic states.

Abstract

High field specific heat, Cp, and magnetic susceptibility, \c{hi}, measurements were performed on the quasi-two dimensional Heisenberg antiferromagnet [Cu(pyz)2(pyO)2](PF6)2. While no Cp anomaly is observed down to 0.5 K in zero magnetic field, the application of field parallel to the crystallographic ab-plane induces a lambda-like anomaly in Cp, consistent with Ising-type magnetic order. On the other hand, when the field is parallel to the c-axis, Cp and \c{hi} show evidence of XY-type antiferromagnetism. We argue that it is a small but finite easy-plane anisotropy in quasi-two dimensional [Cu(pyz)2(pyO)2](PF6)2 that allows the unusual observation of field induced XY and Ising-type magnetic states.