Thes-f model with Coulomb repulsion: Thermodynamics of two atomic cluster. Spin 1/2 |
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Authors: | M Matlak A Ramakanth K Skrobiś |
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Institution: | (1) Institut für Theoretische Physik II, Westfälische Wilhelms Universität, Domagkstrasse 75, D-4400 Münster, Germany;(2) Present address: Instytut Fizyki, Uniwersytet lski w Katowicach, Uniwersytecka 4, PL-40 007 Katowice, Poland;(3) Present address: Department of Physics, Kakatiya University, 506009 Warangal, India |
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Abstract: | A cluster of two atoms described by thes-f model with Coulomb repulsion has been considered. The interaction between localized 4f electrons (S=1/2) is taken in the molecular field approximation. The thermodynamic quantities like magnetization, specific heat and correlation functions n
, n
, S
z
n
, S
z
n
, S
z (n
–n
), n
n
and S
+
a
+
a
as functions of temperature are presented for different band fillingN=0, 0.5, 1, 1.5, 2. The dependence of Curie temperature onN is calculated. The phase diagram forN=1 (T=0K) shows the possibility of existence of two phases: paramagnetic and ferromagnetic.The Curie temperature and the specific heat as functions ofN exhibit similar trends as found in experiments on doped magnetic semiconductors. |
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Keywords: | |
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