Doping effects in low dimensional antiferromagnets

TL;DR

This paper investigates how non-magnetic impurities affect magnetic properties in low-dimensional antiferromagnets, focusing on Knight shifts around vacancies in 1D and 2D Heisenberg models, revealing insights into magnetic correlations.

Contribution

It provides detailed analysis of Knight shifts caused by impurities in low-dimensional antiferromagnets, highlighting the spatial and temperature dependence of magnetic correlations.

Findings

Large Knight shifts occur around impurities.

Knight shifts depend on distance and temperature.

Results elucidate magnetic correlation patterns.

Abstract

The study of impurities in low dimensional antiferromagnets has been a very active field in magnetism ever since the discovery of high temperature superconductivity. One of the most dramatic effects is the appearance of large Knight shifts in a long range around non-magnetic impurities in an antiferromagnetic background. The dependence of the Knight shifts on distance and temperature visualizes the correlations in the system. In this work we present the results for Knight shifts around a single vacancy in the one and two dimensional Heisenberg model.