Low-Dimensional Structure and Magnetism of the Quantum Antiferromagnet Rb<sub>4</sub>Cu(MoO<sub>4</sub>)<sub>3</sub> and the Structure of Rb<sub>4</sub>Zn(MoO<sub>4</sub>)<sub>3</sub>
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Single crystals of the quantum low-dimensional antiferromagnet Rb4Cu(MoO4)3 and the nonmagnetic analogue Ru4Zn(MoO4)3 have been synthesized by a flux-growth method. Detailed structural studies indicate that the Cu(II)−O network separated by a MoO4 layer has a strongly anisotropic hybridization along the a-axis, forming a quasi-one-dimensional (1-d) chain of Cu(II) S = 1/2 spins. Furthermore, our low-temperature thermodynamic measurements have revealed that a quantum paramagnetic state with Wilson ratio ∼2 remains stable down to at least 0.1 K, 100 times lower than the intrachain antiferromagnetic coupling scale. The low-temperature magnetic and thermal properties are found to be consistent with theoretical predictions made for a 1-d network of S = 1/2 spins.
