Magnetic ordering in a doped frustrated spin-Peierls system

TL;DR

This paper investigates magnetic ordering in a doped quasi-one-dimensional spin-Peierls system using quantum Monte Carlo simulations, revealing Curie-like susceptibility behavior and finite staggered magnetization at low temperatures.

Contribution

It introduces an effective two-dimensional Hamiltonian for doped spin-Peierls systems and analyzes magnetic properties using advanced simulation techniques.

Findings

Susceptibility exhibits Curie-like behavior at low temperatures.

Finite staggered magnetization persists as temperature approaches zero.

Doping influences the three-dimensional Neel temperature.

Abstract

Based on a model of a quasi-one dimensional spin-Peierls system doped with non-magnetic impurities, an effective two-dimensional Hamiltonian of randomly distributed S=1/2 spins interacting via long-range pair-wise interaction is studied using a stochastic series expansion quantum Monte Carlo method. The susceptibility shows Curie-like behavior at the lowest temperatures reached although the staggered magnetisation is found to be finite for $T\to 0$. The doping dependance of the corresponding three-dimensional Neel temperature is also computed.