Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.29: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

The α-RuCl3 honeycomb system: magnetic anisotropy, high field torque magnetometry and Li- intercalation — •Michael Baenitz1, Christof Haas2, Kimberly Modic1, Mayukh Majumder1, Hiroshi Yasuoka1, Helge Rosner1, Alexander Tsirlin2, Ernst Wilhelm Scheidt2, Wolfgang Scherer2, and Markus Schmidt11MPI for the Chemical Physics of Solids, 01187 Dresden, Germany — 2Institut fuer Physik, Universitaet Augsburg, 86135 Augsburg, Germany

4d- and 5d-magnets show a wide variety of magnetic ground states due to crystal electric field (CEF) splitting and strong spin-orbit coupling (SOC). The Heisenberg-Kitaev model (HKM) was successfully applied for the competing bond-dependent exchange interactions in the 5d-honeycomb iridates. α-RuCl3 turns out to be an excellent candidate for that model because the low-spin 3+ state of Ru (4d5) is equivalent to the low-spin 4+ state of Ir (5d5). α-Ru trichloride exhibit a strong magnetic anisotropy evidenced from specific heat and magnetization measurements on single crystals [1]. Here we present torque magnetometry in fields up to 65 T combined with angular dependent magnetization measurements in fields up to 7 T on highly pure single crystals. Furthermore we succeeded in the intercalation of Li into the α-RuCl3 lattice which leads to a suppression of the 8K magnetic order and a reduction of the Curie Weiss moment. Reducing the valency of Ru 3+ towards the 2+ state is rather interesting and opens up a new route to tune this qunatum magnet towards the spin liquid state.

[1] M. Majumder et al. PRB 91 (2015)

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