Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102504
Title: Strong fluctuations near the frustration point in cubic lattice ferromagnets with localized moments
Authors: Ignatenko, A. N.
Katanin, A. A.
Irkhin, V. Y.
Issue Date: 2013
Citation: Ignatenko A. N. Strong fluctuations near the frustration point in cubic lattice ferromagnets with localized moments / A. N. Ignatenko, A. A. Katanin, V. Y. Irkhin. — DOI 10.1134/S0021364013040073 // JETP Letters. — 2013. — Vol. 97. — Iss. 4. — P. 209-213.
Abstract: Thermodynamic properties of cubic Heisenberg ferromagnets with competing exchange interactions are considered near the frustration point where the coefficient D in the spin-wave spectrum Ek ~ Dk2 vanishes. Within the Dyson-Maleev formalism, it is found that, at low temperatures, thermal fluctuations stabilize ferromagnetism by increasing the value of D. For not overly strong frustration, this leads to an unusual "concave" shape of the temperature dependence of magnetization, which is in agreement with experimental data on europium chalcogenides. The phase diagram is constructed by means of Monte Carlo simulation, and suppression of the magnetization and Curie temperature is found in comparison with the results of the spin-wave theory. This effect is explained by the presence of nonanalytical corrections to the spin-wave spectrum which are represented in the lowest order by the term ~(T/S)2k2lnk. © 2013 Pleiades Publishing, Ltd.
URI: http://hdl.handle.net/10995/102504
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84876449677
PURE ID: 916629
3c88653c-184a-4eb3-9c33-02c32c8f2ea6
ISSN: 213640
DOI: 10.1134/S0021364013040073
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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