Critical properties of doped coupled spin-Peierls chains

TL;DR

This study investigates how non-magnetic impurities affect coupled spin-Peierls chains at low temperatures, revealing a scaling regime with power-law behaviors linked to large correlated spin clusters.

Contribution

It introduces a generic model for doped spin-Peierls chains and analyzes its properties using advanced numerical methods, highlighting the emergence of a scaling regime.

Findings

Identification of a temperature scaling regime with power-law behaviors

Correlation of large spin clusters with observed scaling properties

Insights into impurity effects on spin-Peierls chain dynamics

Abstract

Using numerical Real Space Renormalisation Group methods as well as Stochastic Series Expansions Quantum Monte Carlo simulations a generic model of diluted spin-1/2 impurities interacting at long distances is investigated. Such a model gives a generic description of coupled dimerized spin-Peierls chains doped with non-magnetic impurities at temperatures lower than the spin gap. A scaling regime with temperature power-law behaviors in several quantities like the uniform or staggered susceptibilities is identified and interpreted in terms of large clusters of correlated spins.