Quantum fluctuation effects on the ordered Moments in a two dimensional frustrated ferrimagnet

TL;DR

This paper investigates how quantum fluctuations influence the ordered magnetic moments in a novel 2D frustrated ferrimagnet model, revealing a quantum phase transition with characteristics of both 2D antiferromagnetic and 1D ferrimagnetic systems.

Contribution

It introduces a new 2D frustrated quantum spin-1/2 model with alternating chains and analyzes quantum fluctuations and phase transitions within it.

Findings

Quantum fluctuations reduce ordered moments at inequivalent sites.

Identification of a quantum phase transition with mixed characteristics.

Insights into the stability of ferrimagnetic order in frustrated 2D systems.

Abstract

We propose a novel two-dimensional (2D)frustrated quantum spin-1/2 anisotropic Heisenberg model with alternating ferromagnetic and antiferromagnetic magnetic chains along one direction and antiferromagnetic interactions along the other. The (mean-field) ground state is ferrimagnetic in certain range of the interaction space. Spin-wave theory analysis of the reduction of ordered moments at inequivalent spin sites and the instability of the spin waves suggest a quantum phase transition which has the characteristics of both the frustrated two-dimensional antiferromagnetic S=1/2 ($J_1, J_2$) model and 1D S$_1$=1, S$_2$=1/2 quantum ferrimagnetic model.