Effects of Impurities in Quasi-One-Dimensional S=1 Antiferromagnets

TL;DR

This study uses quantum Monte Carlo simulations to explore how magnetic and non-magnetic impurities affect phase transitions in weakly coupled S=1 antiferromagnetic chains, providing insights relevant to experimental observations.

Contribution

It presents a detailed analysis of impurity effects on transition temperatures in S=1 antiferromagnetic chains using advanced simulation techniques.

Findings

Transition temperatures vary with impurity spin magnitude.

Magnetic impurities induce different phase transition behaviors than non-magnetic ones.

Results align with some experimental findings on impurity effects.

Abstract

For the weakly coupled S=1 antiferromagnetic Heisenberg chains on a simple cubic lattice, the effects of magnetic impurities are investigated by the quantum Monte Carlo method with the continuous-time loop algorithm. The transition temperatures of the impurity-induced phase transitions for magnetic impurities with S=1/2, 3/2, and 2 are determined and compared with the transition temperature induced by the non-magnetic impurities. Implications on the experimental results are discussed.