Spin-phonon induced magnetic order in magnetized Spin Ice systems

27th International Conference on Low Temperature Physics

Albarracín, F. A. Gómez^1 ; Cabra, D.C.^1 ; Rosales, H.D.^1 ; Rossini, G.L.^1

IFLP-Departamento de Física, Universidad Nacional de la Plata, C.C. 67, La Plata

1900, Argentina^1

关键词: Adiabatic limit;    Analytical calculation;    External fields;    External magnetic field;    Induced magnetic order;    Lattice deformation;    Magnetization curves;    Spin interaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/4/042007/pdf
DOI  :  10.1088/1742-6596/568/4/042007

来源: IOP

【 摘 要 】

We study the behavior of spin ice pyrochlore systems above the well known [111] 1/3 plateau, under slight deviations of the direction of the external field. We model the relevant degrees of freedom by Ising spins on the kagome lattice. We propose the inclusion of lattice deformations, which imply phononic degrees of freedom in the adiabatic limit. We use analytical calculations to estimate how these new degrees of freedom affect the short and long range spin interactions in the presence of an external magnetic field. We then obtain the magnetization curves, explore the phases and the ground states of this system in the presence of magnetic field by Monte Carlo simulations. We discuss comparisons with experimental results.