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MA: Fachverband Magnetismus

MA 21: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

MA 21.3: Vortrag

Dienstag, 21. März 2017, 10:00–10:15, HSZ 304

Magnetism of honeycomb ruthenate Ag₃LiRu₂O₆ without singlet dimers — •Tomohiro Takayama^1,2 and Hidenori Takagi^1,2,3 — ¹Max Planck Institute for Solid State Research, Stuttgart, Germany — ²FMQ3, University of Stuttgart, Stuttgart, Germany — ³Department of Physics, University of Tokyo, Tokyo, Japan

Honeycomb-based transition-metal oxides currently attract interests as novel quantum magnets. 5d honeycomb iridates were theoretically proposed to host quantum spin liquid state owing to bond-dependent magnetic coupling (Kitaev coupling)[1], and experimental verifications of such spin liquid state are intensively under way. On the other hand, honeycomb ruthenate Li₂RuO₃ is known to form spin-singlet dimers and the ground state is non-magnetic insulator [2].

By using ion-exchange reaction, we have synthesized silver-intercalated honeycomb ruthenate Ag₃LiRu₂O₆ [3]. Possibly due to the formation of strong O²⁻-Ag⁺-O²- between the honeycomb layers, the singlet-dimer formation is suppressed in Ag₃LiRu₂O₆, and Ru⁴⁺ magnetism survives down to low temperatures. Despite Curie-Weiss like behavior observed at high temperatures (θ_CW ∼ -40 K), we did not see any magnetic order down to 2 K in magnetization and heat capacity measurements. We discuss the possible magnetic ground state of this honeycomb ruthenate.

[1] G. Jackeli and G. Khaliullin, Phys. Rev. Lett. 102, 017205 (2009)

[2] Y. Miura et al., J. Phys. Soc. Jpn., 76, 033705 (2007)

[3] S. Kimber et al., J. Mater. Chem. 20, 8021 (2010)