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

R. Pikuła and J. Kirkiewicz Department of Physics, Maritime University, Wały Chrobrego 1/2, 70-500 Szczecin, Poland

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Received: 22 02 2007; Revised version: 15 01 2008;

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.

DOI: 10.12693/APhysPolA.113.669 PACS numbers: 05.70.Jk, 75.30.Kz