CHARLA IFLYSIB VIRTUAL Viernes 31/03 · Ludovic Jaubert · «A glimpse of the 4th dimension in a spin liquid»

Título: A glimpse of the 4th dimension in a spin liquid

Expositor: Ludovic Jaubert – CNRS, Université de Bordeaux, LOMA, Talence, France

Fecha: Viernes 31/03/2023 – 10:30 hs

Resumen:

What we colloquially know about frustration, is that it prevents magnetic order. But the interesting part is not so much the absence of something, but rather what happens in its place.
Frustration usually stems from one of only two elementary units of spins: either triangles or tetrahedra. In this seminar we will explore an alternative route for frustration via molecular design in the metal-azolate framework [Mn(ta)2], whose units are centred tetrahedra made of five spins [1]. Using a combination of experiments, simulations and field theory, we will show that this material is proximate to a spin liquid described as a three-dimensional «slab» of a four-dimensional emergent Coulomb field. We will also explain the large degeneracy and robustness of this spin liquid, how it stabilises monopoles down to the lowest temperatures, and how it evolves in presence of perturbations such as further neighbour couplings [1,2]. By varying the ligand and nature of the magnetic ion, we are convinced that metal-organic frameworks unlock a new door in frustrated magnetism beyond the standard kagome and pyrochlore structures.

[1] Nutakki, Röß-Ohlenroth, Volkmer, Jesche, Krug von Nidda, Tsirlin, Gegenwart, Pollet & Jaubert, “Frustration on a centred pyrochlore lattice in metal-organic frameworks”, arXiv:2203.08780

[2] Nutakki, Pollet & Jaubert (in preparation)

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