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We study the temperature dependence of the low temperature spinconfigurations, investigating the magnetization profile of the local states dueto the impurities and the two point correlation function centered in one of theimpurities. This correlation is found to be weak against temperature effectsalthough the magnetization profile in the triplet state is visible up to highertemperatures. Here we introduce a loop cluster quantum Monte-Carlo method witha fixed magnetization Mz in order to study the correlations in the ground stateof a given value of Mz. From the population distribution of magnetization, thevery small energy gap between the quasi degenerate states due to the impuritiesis obtained.Comment: 13 pages, 16 figures. Corrected version due to inverted picture 3a  and 3b. RevTex. Submitted to Phys. Rev.

physical review. b, condensed matter

Temperature dependence of local states due to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>impurities and their correlation in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mn /></mml:math>Heisenberg chain

Temperature dependence of local states due toS=12impurities and their correlation in aS=1Heisenberg chain