Long-range dynamics related to magnetic impurities in the two-dimensional Heisenberg antiferromagnet

Article

关键词: SQUARE-LATTICE;    FINITE-SIZE;    QUANTUM IMPURITY;    NQR RELAXATION;    SYSTEM;   

DOI  :  10.1103/PhysRevB.68.094426

来源: SCIE

【 摘 要 】

We consider a magnetic impurity in the two-dimensional Heisenberg antifferomagnet with long-range antiferromagnetic order. The present work employs three different methods: finite cluster considerations, spin-wave perturbation theory, and semiclassical nonlinear sigma model. At low temperature the impurity magnetic susceptibility has a Curie term (proportional to1/T) and a logarithmic correction [proportional to ln (T)]. We calculate the Curie term and the logarithmic correction and derive related Ward identity for the impurity-spin-wave vertex.

【 授权许可】

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