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- W2025842760 abstract "The thermodynamic properties of $Sensuremath{geqslant}1$ ferromagnetic chains with an easy-axis single-ion anisotropy are investigated at arbitrary temperatures by both a Green-function approach, based on a decoupling of three-spin operator products, and by exact diagonalizations of chains with up to $N=12$ sites using periodic boundary conditions. A good agreement between the results of both approaches is found. For the $S=1$ chain, the temperature dependence of the specific heat reveals two maxima, if the ratio of the anisotropy energy $D$ and the exchange energy $J$ exceeds a characteristic value, $D∕J>7.4$, and only one maximum for $D∕J<7.4$. This is in contrast to previous exact diagonalization data for comparably small chains $(Nensuremath{leqslant}7)$ using open boundary conditions. Comparing the theory with experiments on dibromo Ni complexes the fit to the specific heat yields concrete values for $D$ and $J$ which are used to make predictions for the temperature dependences of the spin-wave spectrum, the correlation length, and the transverse magnetic susceptibility." @default.
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- W2025842760 date "2005-08-31" @default.
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- W2025842760 title "Thermodynamics of<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:mrow></mml:math>ferromagnetic Heisenberg chains with uniaxial single-ion anisotropy" @default.
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- W2025842760 doi "https://doi.org/10.1103/physrevb.72.064454" @default.
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