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  1. 2 Acta Physica Polonica A

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  1. 1 2008

  2. 1 2006

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  1. 2 Kirkiewicz J.

  2. 2 Pikuła R.

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A Dilute Magnet with Ferro- and Antiferromagnetic Exchange Interactions. The Structural Fluctuations Analysis

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Pikuła R., Kirkiewicz J.
Acta Physica Polonica A
|
2008
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vol. 113
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issue 2
669-676
EN
We analysed the influence of the fluctuations in distribution of magnetic atoms on the properties of dilute magnets with mixed ferro- and antiferromagnetic exchange interactions. The high- and low concentration approximations were found to give very close results and the most important impact on the physical quantities origins from the lowest, square fluctuations which play the predominant role in the whole range of concentrations of magnetic atoms.
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Magnetization Processes in Dilute Metamagnets with Ferro- and Antiferromagnetic Exchange Interactions

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Pikuła R., Kirkiewicz J.
Acta Physica Polonica A
|
2006
|
vol. 110
|
issue 1
25-39
EN
Using the Green function method there has been presented the mathematical description of dilute two sub-lattice metamagnets with ferro- and antiferromagnetic exchange interactions. The Green function averaging procedure is based on the Cumulant Expansion Technique and includes any localized Green function irrespectively of the decoupling algorithm making the chain system of equations self-consistent. The derived form of the averaged Green function is the base for the analysis of magnetization processes and phase transitions occurring in the system under the influence of external magnetic field. It has been found in particular that the tricritical point and the second-order phase transition vanish when concentrations of magnetic atoms coupled with different sub-lattice points become different.
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