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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Phase diagram of the helical structure of a two-subsystem frustrated antiferromagnet
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 108, Is. 1. - P72-82. - ISSN 1063-7761, DOI 10.1134/S1063776109010105
Примечания : Cited References: 25
Предметные рубрики: GROUND SPIN-STATE
PYROCHLORE ANTIFERROMAGNET
TRIANGULAR-LATTICE
CLASSICAL-THEORY
MODEL
TRANSITION
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--antiferromagnetism--free energy--magnetic devices--magnetic fields--magnetic structure--phase diagrams--vectors--antiferromagnet--antiferromagnetic--antiferromagnetic sublattices--comparative analysis--critical fields--external fields--field boundaries--first derivatives--first-order transitions--helical orderings--helical phase--helical structures--higher temperatures--incommensurate magnetic structures--isotropic exchanges--magnetic subsystems--magnetization jumps--mean-field approximations--minimum free energies--numerical minimizations--spatial displacements--temperature dependences--thermodynamic potentials--variational equations--wave vectors--phase transitions
Аннотация: The expansion of the thermodynamic potential for the two-subsystem antiferromagnet with frustrated intersubsystem isotropic exchange is obtained. It is demonstrated that this expansion contains the first derivatives with respect to the antiferromagnetic vectors of the subsystems, i.e., the Lifshitz invariant. The equation for the temperature-field boundary of the helical phase for the two-subsystem frustrated antiferromagnet is derived by linearizing the variational equations for the minimum free energy within the mean-field approximation. Relationships are obtained for the critical field at T = 0, the angle of canting of moments of the antiferromagnetic sublattices, and the temperature of spontaneous appearance of helical ordering in the absence of an external field. It is revealed that there is a second higher temperature of formation of the helical magnetic structure induced by the magnetic field with the wave vector of the helix nonmonotonically depending on the external field. The phase boundary of the helical phase and the temperature dependence of the orientation of moments of the magnetic subsystem with weak exchange interaction are determined using numerical minimization of the free energy. It is shown that the transition to the commensurate phase is a first-order transition with a small magnetization jump. A comparative analysis of models with different spatial displacements of ions in the subsystems along the direction of the vector of the helical structure is performed. A criterion is proposed for the choice of the direction of the vector of the incommensurate magnetic structure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Magnetic phases of a stochastic anisotropic hexagonal magnet
Место публикации : Fiz. Tverd. Tela. - 1990. - Vol. 32, Is. 11. - P.3220-3229. - ISSN 0367-3294
Примечания : Cited References: 11
Предметные рубрики: TRIANGULAR-LATTICE
ANTIFERROMAGNETS
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