Coupled spin-1/2 antiferromagnetic chain Cs2LiRuCl6 with partially disordered crystal lattice

Kazumitsu Watanabe, Nobuyuki Kurita, Hidekazu Tanaka, Haruki Sugiyama, Hidehiro Uekusa, Ismael F. Diaz-Ortega, Hiroyuki Nojiri

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We determined the crystal structure of Cs2LiRuCl6, which was synthesized first in this work, and investigated its magnetic properties. Cs2LiRuCl6 has a hexagonal structure composed of linear chains of face-sharing RuCl6 and LiCl6 octahedra. In two-thirds of the structural chains, Ru3+ and Li+ sites are almost ordered, while in the other chains their sites are disordered. This situation is analogous to the ground state of the antiferromagnetic Ising model on a triangular lattice. Using electron paramagnetic resonance, we evaluated the g factors of Ru3+ with effective spin-1/2 as gc = 2.72 and gab = 1.50 for magnetic fields H parallel and perpendicular to the c axis, respectively. Magnetization curves for H ǁ c and H ⊥ c are highly anisotropic. However, these magnetization curves approximately coincide when normalized by the g factors. It was found from the magnetization and specific heat results that Cs2LiRuCl6 can be described as a coupled one-dimensional S = 1/2 Heisenberg-like antiferromagnet with J/kB ≃ 3.7 K. Three-dimensional ordering occurs at TN = 0.48 K. A magnetic phase diagram for H ǁ c is also presented.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2020 Nov 17

ASJC Scopus subject areas

  • General

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