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- W1966950213 abstract "We discuss effects of various impurities on the magnetic susceptibility and the specific heat of the quantum S=1/2 Heisenberg antiferromagnet on a two-dimensional square lattice. For impurities with spin S_i > 0 (here S_i=1/2 in the case of a vacancy or an added spin, and S_i=1 for a spin coupled ferromagnetically to its neighbors), our quantum Monte Carlo simulations confirm a classical-like Curie susceptibility contribution S_i^2/4T, which originates from an alignment of the impurity spin with the local N'eel order. In addition, we find a logarithmically divergent contribution, which we attribute to fluctuations transverse to the local N'eel vector. We also study frustrated and nonfrustrated bond impurities with S_i=0. For a simple intuitive picture of the impurity problem, we discuss an effective few-spin model that can distinguish between the different impurities and reproduces the leading-order simulation data over a wide temperature range." @default.
- W1966950213 created "2016-06-24" @default.
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- W1966950213 date "2004-07-12" @default.
- W1966950213 modified "2023-09-26" @default.
- W1966950213 title "Impurity effects at finite temperature in the two-dimensional<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>Heisenberg antiferromagnet" @default.
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- W1966950213 doi "https://doi.org/10.1103/physrevb.70.024406" @default.
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