Phys. Rev. B 50, 4244–4247 (1994)Relaxation in the neighborhood of a magnetic impurity in the s=1/2 Heisenberg chain at high temperatures
A Mori-Lee theoretic study of spin relaxation in the neighborhood of a magnetic impurity in the s=1/2 nearest-neighbor (NN) Heisenberg chain at high temperatures is presented. Our calculations suggest that in the limit of zero impurity coupling, the spectral function for the ‘‘surface spin’’ is consistent with a set of discrete frequencies given approximately by wn≊[n(w0+1/4)-1/4] against a shallow continuum background, where w0≊3J/4 with 2J being the coupling between NN spins. The frequencies broaden as the impurity coupling is increased to the NN coupling. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.50.4244
DOI:
10.1103/PhysRevB.50.4244
PACS:
75.10.Jm, 75.30.Hx, 75.40.Gb
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