Reviews of topical problems

Magnetic order and spin fluctuations in low-dimensional insulating systems

Mikheev Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, S Kovalevskoi str. 18, Ekaterinburg, 620108, Russian Federation

The current theoretical and experimental situations are reviewed for low-dimensional insulating systems with a low magnetic transition temperature ТM and pronounced short-range magnetic order above this temperature. Both the standard and self-consistent spin-wave theories are shown to be insufficient to quantitatively describe the experimental data on these systems. Field-theoretical approaches taking into account the contribution of the spin-fluctuation excitations (neglected in the spin-wave theories) to the thermodynamic properties of ferro- and antiferromagnets are discussed.

Fulltext is available at IOP
PACS: 75.10.−b, 75.30.Ds, 75.40.Cx (all)
DOI: 10.1070/PU2007v050n06ABEH006313
Citation: Katanin A A, Irkhin V Yu "Magnetic order and spin fluctuations in low-dimensional insulating systems" Phys. Usp. 50 613–635 (2007)
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Оригинал: Катанин А А, Ирхин В Ю «Магнитный порядок и спиновые флуктуации в низкоразмерных системах» УФН 177 639–662 (2007); DOI: 10.3367/UFNr.0177.200706c.0639

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