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MA: Fachverband Magnetismus

MA 38: Theory of strongly correlated systems

MA 38.3: Talk

Thursday, March 15, 2018, 10:15–10:30, H 0110

Time-reversal origin of anisotropies for non-Kramers magnetic states — •Bruno Tomasello and Tim Ziman — Institut Laue-Langevin, CS 20156, Cedex 9, 38042 Grenoble, France

Magnetic anisotropies of rare-earth ions characterise unconventional phases in many condensed matter systems. The theoretical effort for describing such phases typically begins by “adjusting” suitable pseudo-spin Hamiltonians which can account for complex exotic behaviours and yet involve simple enough mathematics. A case per se are non-Kramers bound-ions whose spectra features a neat separation of the lowest energy states from the higher ones. In this talk, focusing on non-Kramers magnetic ions, I will discuss the relationship between time-reversal properties and the origin of axial anisotropies. Emphasis will be given to identifying the microscopic mechanisms of interest from established theoretical frameworks. The analysis will be contextualised in the perspectives of recent dispersive signatures in the low-temperature neutron-scattering experiments on powders of the garnet Tb₃Ga₅O₁₂, which is well known for detection of phonon Hall physics.