Strong fluctuations near the frustration point in cubic lattice ferromagnets with localized moments

被引：7

作者：

Ignatenko, A. N. ^{[1
]}

Katanin, A. A. ^{[1
,2
]}

Irkhin, V. Yu. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg 620090, Russia

[2] Ural Fed Univ, Ekaterinburg 620002, Russia

来源：

JETP LETTERS | 2013年 / 97卷 / 04期

关键词：

SPIN-WAVE THEORY; LONG-RANGE ORDER; HEISENBERG MAGNETS; MODELS;

D O I：

10.1134/S0021364013040073

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 E (k) similar to Dk (2) 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 similar to T/S)(2) k (2)lnk.

引用

页码：209 / 213

页数：5

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