Thermal fluctuations in the conical state of monoaxial helimagnets

Laliena, V. ; Kato, Y. ; Albalate, G. ; Campo, J. (Universidad de Zaragoza)

Resumen: The effect of thermal fluctuations on the phase structure of monoaxial helimagnets with external magnetic field parallel to the chiral axis is analyzed by means of a saddle point expansion of the free energy. The phase transition that separates the conical and forced ferromagnetic phases is changed to first order by the thermal fluctuations. In a purely monoaxial system the pitch of the conical state remains independent of temperature and magnetic field, as in mean-field theory, even when fluctuations are taken into account. However, in the presence of weak Dzyaloshinskii-Moriya interactions in the plane perpendicular to the chiral axis, thermal fluctuations induce a dependence of the pitch on temperature and magnetic field. This may serve to determine the nature of magnetic interactions in such systems.

Idioma: Inglés

DOI: 10.1103/PhysRevB.98.144445

Año: 2018

Publicado en: Physical Review B 98, 14 (2018), 144445 [10 pp]
ISSN: 2469-9950

Factor impacto SCIMAGO: 1.502 - Electronic, Optical and Magnetic Materials (Q1) - Condensed Matter Physics (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68200-C2-2-P

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)