Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 5: Frustrated Magnets – Spin Liquids

TT 5.6: Talk

Monday, September 5, 2022, 16:30–16:45, H10

Frustrated magnetism in pyrochlore rare earth materials: a pseudofermion-FRG study — •Bernhard Wortmann — Univeristät zu Köln — Köln — Deutschland

The family of rare earth pyrochlore materials is intensely scrutinized in the search for quantum spin-ice and quantum spin liquid phases. On the theoretical side, an initial focus has been to explore frustration phenomena in Heisenberg models in order to model the low temperature physics of these materials. It has, however, become increasingly clear that one has to also consider the sometime dominating effect of anisotropic exchange interactions, such as bond-directional Kitaev or Gamma couplings. In this talk, I will discuss the phase diagram of the Heisenberg-Kitaev-Gamma model on the pyrochlore lattice, calculated for S=1/2 quantum spins using the pseudofermion functional renormalization group. The rich phase diagram obtained when considering the competition of antiferromagnetic and ferromagnetic exchanges allows us to identify coupling regimes where we find agreement with recent neutron scattering experiments.