Magnetic order and spin fluctuations in low-dimensional insulating systems

Details Magnetic order and spin fluctuations in low-dimensional insulating systems Magnetic order and spin fluctuations in low-dimensional insulating systems

2007-09-17

arxiv.org/abs/0709.2690v1

Physics-Uspekhii 50, 613 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

This is the russian version of the paper; the english version can be accessed from the DOI link below or requested from the au

Scientific paper

10.1070/PU2007v050n06ABEH006313

The current theoretical and experimental situations are reviewed for low-dimensional insulating systems with a low magnetic transition temperature TM 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.

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