Neel order in doped quasi one-dimensional antiferromagnets

TL;DR

This paper investigates how doping affects the Neel temperature in quasi one-dimensional S=1/2 antiferromagnets, revealing a significant decrease in magnetic ordering temperature with increased impurity levels.

Contribution

It combines finite chain susceptibility analysis with mean field theory to quantify doping effects on Neel temperature in quasi 1D antiferromagnets.

Findings

Neel temperature drops up to fivefold with doping.

Odd and even chain lengths show different susceptibility behaviors.

Doping significantly suppresses magnetic order.

Abstract

We study the Neel temperature of quasi one-dimensional S=1/2 antiferromagnets containing non-magnetic impurities. We first consider the temperature dependence of the staggered susceptibility of finite chains with open boundary conditions, which shows an interesting difference for even and odd length chains. We then use a mean field theory treatment to incorporate the three dimensional inter-chain couplings. The resulting Neel temperature shows a pronounced drop as a function of doping by up to a factor of 5.