Coupled spin- 12 antiferromagnetic chain Cs2LiRuCl6 with partially disordered crystal lattice

We determined the crystal structure of ${\mathrm{Cs}}_{2}{\mathrm{LiRuCl}}_{6}$, which was synthesized in this work, and investigated its magnetic properties. ${\mathrm{Cs}}_{2}{\mathrm{LiRuCl}}_{6}$ has a hexagonal composed linear chains face-sharing ${\mathrm{RuCl}}_{6}$ ${\mathrm{LiCl}}_{6}$ octahedra. In two thirds structural chains, ${\mathrm{Ru}}^{3+}$ ${\mathrm{Li}}^{+}$ sites are almost ordered, while other their disordered. This situation is analogous to ground state antiferromagnetic Ising model on triangular lattice. Using electron paramagnetic resonance, we evaluated $g$ factors with effective spin-$\frac{1}{2}$ as ${g}_{c}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}2.72$ ${g}_{ab}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}1.50$ for fields $H$ parallel perpendicular $c$ axis, respectively. Magnetization curves $H\ensuremath{\parallel}c$ $H\phantom{\rule{0.16em}{0ex}}\ensuremath{\perp}\phantom{\rule{0.16em}{0ex}}c$ highly anisotropic. However, these magnetization approximately coincide when normalized by factors. It found from specific heat results that can be described coupled one-dimensional $S\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}1/2$ Heisenberg-like antiferromagnet $J/{k}_{\mathrm{B}}\phantom{\rule{0.16em}{0ex}}\ensuremath{\simeq}\phantom{\rule{0.16em}{0ex}}3.7$ K. Three-dimensional ordering occurs at ${T}_{\mathrm{N}}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}0.48$ A phase diagram also presented.