Quantum impurity in a nearly critical two-dimensional antiferromagnet

@article{Sachdev1999QuantumII,
  title={Quantum impurity in a nearly critical two-dimensional antiferromagnet},
  author={Imroz Singh Sachdev and Buragohain and Vojta},
  journal={Science},
  year={1999},
  volume={286 5449},
  pages={
          2479-82
        }
}
The spin dynamics of an arbitrary localized impurity in an insulating two-dimensional antiferromagnet, across the host transition from a paramagnet with a spin gap to a Neel state, is described. The impurity spin susceptibility has a Curie-like divergence at the quantum-critical coupling, but with a universal effective spin that is neither an integer nor a half-odd integer. In the Neel state, the transverse impurity susceptibility is a universal number divided by the host spin stiffness (which… CONTINUE READING

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