Magnetization of undoped 2-leg S = 1/2 spin ladders in La4Sr10Cu24O41

TL;DR

This paper investigates the magnetic properties of undoped 2-leg S=1/2 spin ladders in La4Sr10Cu24O41, revealing how their magnetization behavior differs from doped chains and applying theoretical models to interpret the data.

Contribution

It provides experimental magnetization data for undoped spin ladders and applies a theoretical low-temperature approximation to analyze their magnetic response.

Findings

Chain subsystem exhibits short-range antiferromagnetic correlations.

High-temperature behavior follows Curie-Weiss law.

Ladder magnetization analyzed using Troyer et al.'s model.

Abstract

Magnetization data of single crystalline La4Sr10Cu24O41 are presented. In this compound, doped spin chains and undoped spin ladders are realized. The magnetization, at low temperatures, is governed by the chain subsystem with a finite interchain coupling which leads to short range antiferromagnetic spin correlations. At higher temperatures, the response of the chains can be estimated in terms of a Curie-Weiss law. For the ladders, we apply the low-temperature approximation for a S=1/2 2-leg spin ladder by Troyer et al.