Magnetic order and moment distribution in doped spin-chain systems

TL;DR

This paper investigates how doping affects magnetic order in quasi-1D antiferromagnetic systems, revealing a crossover in magnetic response and a broad distribution of magnetic moments in the ordered phase.

Contribution

It provides a detailed analysis of magnetic response in finite spin-1/2 chains under a staggered field and models the effects of inter-chain coupling on magnetic ordering and moment distribution.

Findings

Identification of a crossover in magnetic response based on chain length and field strength

Demonstration of Neel order with broad magnetic moment distribution due to inter-chain coupling

Self-consistent determination of magnetic moment distribution in doped spin chains

Abstract

We consider the effect of doping on the magnetic order in quasi one-dimensional (1D) antiferromagnets. First the detailed magnetic response of finite spin-1/2 chains in the presence of a staggered field is determined, which by itself shows an interesting crossover as function of length and field strength. We can then understand the ordering by including an effective coupling between the chains, which results in a Neel ordered phase at low temperatures, but with a broad distribution of magnetic moments that has to be determined self-consistently.