Knight shifts around vacancies in the 2D Heisenberg model

The local response to a uniform field around vacancies in the two-dimensional (2D) spin-1/2 Heisenberg antiferromagnet is determined by numerical quantum Monte Carlo simulations as a function of temperature. It is possible to separate the Knight shifts into uniform and staggered contributions on the...

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Bibliographic Details
Published in:arXiv.org 2005-10
Main Authors: Anfuso, Fabrizio, Eggert, Sebastian
Format: Article
Language:English
Subjects:
Antiferromagnetism
Computer simulation
Heisenberg theory
Impurities
Lattice vacancies
Monte Carlo simulation
NMR
Nuclear magnetic resonance
Statistical models
Two dimensional models
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Summary:The local response to a uniform field around vacancies in the two-dimensional (2D) spin-1/2 Heisenberg antiferromagnet is determined by numerical quantum Monte Carlo simulations as a function of temperature. It is possible to separate the Knight shifts into uniform and staggered contributions on the lattice which are analyzed and understood in detail. The contributions show interesting long and short range behavior that may be of relevance in NMR and susceptibility measurements. For more than one impurity remarkable non-linear enhancement and cancellation effects take place. We predict that the Curie impurity susceptibility will be observable for a random impurity concentration even in the thermodynamic limit.
ISSN:2331-8422
DOI:10.48550/arxiv.0511001