Тип публикации: статья из журнала

Год издания: 2003

Ключевые слова: oxygen, perovskite, ruthenium, strontium, ytterbium, anisotropy, article, calculation, electronics, magnetism, mathematical analysis, temperature dependence

Аннотация: Localized Ru5+ spins in Sr2YRuO6 form a fcc lattice with an antiferromagnetic (AFM) nearest-neighbor (NN) coupling J ? 25 meV and rather low Neel temperature TN = 26 K. Analysis of the electronic structure of Sr2RuO4 results in the effective Heisenberg model. We have studied the effect of frustrations on the AFM type-I structure ofПоказать полностьюSr2YRuO6 in the spin-wave approximation. In the model with only NN coupling the AFM state is unstable due to frustrations, and TN = 0. Stabilization of the AFM state occurs due to the next-nearest-neighbor coupling I or due to the magnetic anisotropy D. Very small values D/J?I/J?10-3 are enough to obtain the experimental values of TN and sublattice magnetization m = 1.85 ?B/Ru (62% from the nominal S = 3/2 value).

Журнал: Physical Review B - Condensed Matter and Materials Physics

Выпуск журнала: Vol. 68, Is. 2

Номера страниц: 244091-244096

• Kuz'min E.V. (Krasnoyarsk State University, Krasnoyarsk 660074, Russian Federation)
• Ovchinnikov S.G. (L. V. Kirensky Institute of Physics, Siberian Br. of Russ. Acad. of Sci., Krasnoyarsk 660036, Russian Federation )
• Singh D.J. (Ctr. for Compl. Materials Science, Naval Research Laboratory, Washington, DC 20375-5320, United States )

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