About non-Kramers magnetic states : time-reversal properties and anisotropies of a bound-ion
Jeudi 23 novembre 2017 14:00
- Duree : 1 heure
Lieu : Salle « Remy Lemaire » (K223) de l’Institut Néel – au n°25 de la rue des martyrs, Grenoble.
Orateur : Bruno TOMASELLO (ILL)
Magnetic anisotropies of rare-earth ions characterise unconventional phases in many condensed matter systems. The theoretical effort for describing such phases typically begins with the "tuning" of 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 well established theoretical frameworks [1,2]. The analysis will be contextualised in the perspectives of recent
experimental findings from the garnet Tb3Ga5O12 [3], which is known for detection ophonon Hall physics [4].
References
[1] A. Abragam and B. Bleaney, Electron Paramagnetic Resonance of Transition Ions (Clarendon Oxford, 1970).
[2] J. S. Griffith, Physical Review 132, 316 (1963), URL https://link.aps.org/doi/10.1103/PhysRev.132.316.
[3] R. Wawrzynczak and collaborators, In preparation (2017).
[4] C. Strohm, G. L. J. A. Rikken, and P. Wyder, Physical Review Letters 95, 155901 (2005), URL https://link.aps.org/doi/10.1103/PhysRevLett.95.155901.
Contact : neel.communication@neel.cnrs.fr
Discipline évènement : (Physique)
Entité organisatrice : (Institut Néel / MCBT)
Nature évènement : (Séminaire)
Site de l'évènement : Polygone scientifique
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