Field-induced disorder in a gapped spin system with non-magnetic impurities

TL;DR

This paper investigates how an external magnetic field can induce a transition from long-range magnetic order to a disordered phase in a gapped spin system with non-magnetic impurities, providing a phase diagram and experimental suggestions.

Contribution

It reveals that magnetic fields can suppress impurity-induced order in gapped spin systems, offering new insights into field-tuned quantum phase transitions.

Findings

Magnetic field can restore disorder in impurity-doped gapped spin systems.

Zero temperature phase diagram mapped in (H,J') plane.

Proposes experimental setups to observe the predicted phenomena.

Abstract

We study S=1/2 dimers which are weakly coupled by three-dimensional antiferromagnetic interactions J'. It is commonly known that doping with non-magnetic impurities immediately induces a long-range Neel order. We show that application of an external magnetic field H may drive the system back to a disordered phase. We discuss the zero temperature phase diagram in the (H,J') plane and we propose suggestions for experiments.