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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 Schmidt¹ — ¹MPI 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)