Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Micromagetic Simulation and Electron Theory of Magnetism

MA 14.4: Vortrag

Dienstag, 12. März 2013, 10:15–10:30, H23

Multiple-q states in classical triangular-lattice Heisenberg antiferromagnet with frustrated interactions — •Andrey Leonov and Maxim Mostovoy — Zernike Institute for Advanced Materials, University of Groningen, The Netherlands

In geometrically frustrated magnets with the triangular lattice, the interplay of nearest-(J1) and next-nearest neighbor (J2) interactions can destabilize the homogeneous magnetic structure and induce diverse incommensurate multiple-q states. Within the basic J1-J2 exchange Hamiltonian with the Zeeman term, the single-q state is the ground state, whereas the double-q (2Q) and the triple-q (3Q) states are only metastable solutions [1]. In this contribution we show that additional magnetic couplings can render the 2Q and 3Q states into thermodynamically stable phases. We also show that at low temperatures the 3Q state in the frustrated triangular antiferromagnet is similar to the skyrmion crystal lattice recently observed in non-centrosymmetric magnets (e.g. MnSi and FeGe), but has a higher degree of degeneracy and the number of Goldstone modes. [1] T. Okubo et al., Phys. Rev. Lett. 108, 017206 (2012); [2] A. Leonov, Ph.D thesis, Dresden University of Technology, Dresden (2012).