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The finite temperature transport properties of a spin-1/2 anisotropicHeisenberg chain with an embedded spin-S impurity are studied. Using primarilynumerical diagonalization techniques, we study the dependence of the dynamicalspin and thermal conductivities on the lattice size, the magnitude of theimpurity spin, the host-impurity coupling, the easy axis anisotropy, as well asthe dependence on temperature. Particularly for the temperature dependence, wediscuss the screening of the impurity by the chain eventually leading to thecutting or healing of the host chain. Numerical results are supported byanalytical arguments obtained in the strong host-impurity coupling regime.

Transport properties of a spin-1/2 Heisenberg chain with an embedded spin-S impurity