Real-space perturbation theory for frustrated magnets: application to magnetization plateaus

International Conference on Strongly Correlated Electron Systems 2014

Zhitomirsky, M.E.^1

Service de Physique Statistique, Magnétisme et Supraconductivité, INAC, CEA, 17 rue des Martyrs, Grenoble Cedex 9

38054, France^1

关键词: Degeneracy lifting;    Frustrated magnet;    Geometrically frustrated magnets;    Heisenberg spin Hamiltonians;    Magnetization plateaus;    Perturbation expansions;    Perturbation theory;    Unified approach;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012110/pdf
DOI  :  10.1088/1742-6596/592/1/012110

来源: IOP

【 摘 要 】

We present a unified approach to the problem of degeneracy lifting in geometrically frustrated magnets with and without an external field. The method treats fluctuations around a classical spin configuration in terms of a real-space perturbation expansion. We calculate two lowest-order contributions for the Heisenberg spin Hamiltonian and use them to study the magnetization processes of spin-S triangular and kagomé antiferromagnets.