Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.50: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Probing the Kitaev-Heisenberg material α-RuCl3 via field-dependent microwave absorption — •Christoph Wellm1,2, Julian Zeisner1,2, Alexey Alfonsov2, Anja Wolter2, Maria Roslova3, Anna Isaeva3, Thomas Doert3, Matthias Vojta4, Bernd Büchner1,2, and Vladislav Kataev1 — 1Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 — 2Institut für Festkörper-und Materialphysik, TU Dresden, D-01062 — 3Fachrichtung Chemie und Lebensmittelchemie, TU Dresden, D-01062 — 4Institut für Theoretische Physik, TU Dresden, D-01062
Topologically ordered states of matter have recently gained much attention due to their novel physical properties, the signatures of which can be experimentally probed. A prime example is the spin liquid realized in the Kitaev honeycomb lattice compass model, where fractionalization of particles leads to broad continuum-like features in the magnetic response. We will present the high-field microwave absorption results on the Mott-Hubbard-insulating material α-RuCl3 which is, due to its structure and strong spin-orbit coupling, a promising candidate for the realization of Kitaev physics. Measurements on a single-crystal were conducted over a frequency range of ν = 70-660 GHz at temperatures ranging from 3-30 K. Strikingly, in addition to previously observed conventional gapped magnon modes, we find a highly unusual broad continuum characteristic of fractionalization which extends to energies below the lowest sharp mode and to temperatures significantly higher than the ordering temperature.