Knight shifts around vacancies in the 2D Heisenberg model

Details Knight shifts around vacancies in the 2D Heisenberg model Knight shifts around vacancies in the 2D Heisenberg model

2005-10-31

arxiv.org/abs/cond-mat/0511001v1

Phys. Rev Lett. 96, 017204 (2006).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, submitted to Phys. Rev. Lett. The latest pdf version can be found at http://www.physik.uni-kl.de/eggert/pa

Scientific paper

10.1103/PhysRevLett.96.017204

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.

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