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  1. 3 Acta Physica Polonica A

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  1. 1 2004

  2. 1 2000

  3. 1 1997

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  1. 3 Latacz Z.

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Magnetoelectric Effect of Cr_{2}O_{3}

100%
Latacz Z.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 5
733-735
EN
A formula for the temperature dependent magnetoelectric susceptibility of Cr_{2}O_{3} is obtained using the method of renormalized spin waves of Nagai and compared with the formula in random phase approximation. The three coefficients a^{g}, a^{LS}, and a^{J} which respectively represent the change in the g-factor, in the crystal field splitting and in the exchange integral due to the electric field parallel to the easy axis, are determined by comparing the theoretical with experimental susceptibility curves, as well as the antiferromagnetic resonance shift.
2
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Correlation Theory of Antiferromagnet Cr_{2}O_{3} for T>T_{N}

100%
Latacz Z.
Acta Physica Polonica A
|
1997
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vol. 92
|
issue 2
403-405
EN
A correlation theory is applied to two-sublattice antiferromagnet Cr_{2}O_{3}, for T>T_{N}. This theory includes pair correlation effects in a self-consistent calculation of both static and dynamic properties. The two kinds of approximations are assumed: the two-pole approximation for the relaxation function of the random force and the mode-mode decoupling procedure for the static and dynamic higher-order quantities. The formulae for the static susceptibility, line-shape function and magnetic cross-section of the inelastic neutron scattering are given for the case of a non-Bravais two-sublattice antiferromagnet.
3
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New Discussion of the Spin Dynamics of Paramagnetic EuO

100%
Latacz Z.
Acta Physica Polonica A
|
2004
|
vol. 106
|
issue 4
515-528
EN
The simplest approximations for a continued-fraction representation of the dynamic relaxation function are used to investigate the spin dynamics of paramagnetic EuO. As the result we can see how the considered approximations predict those wavevectors for which a "spin wave" peak appears in the spectrum. Furthermore, the calculated position of this peak is compared with experiment. The correlation theory within the two-pole approximation is presented in a simple and analytic form.
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