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A new spin-1/2 quasi-one-dimensional antiferromagnet KCuMoO_4(OH) is preparedby the hydrothermal method. The crystal structures of KCuMoO_4(OH) and thealready-known Na-analogue, NaCuMoO_4(OH), are isotypic, comprising chains ofCu^{2+} ions in edge-sharing CuO_4(OH)_2 octahedra. Despite the structuralsimilarity, their magnetic properties are quite different because of thedifferent arrangements of d_{x2-y2} orbitals carrying spins. For NaCuMoO_4(OH),d_{x2-y2} orbitals are linked by superexchange couplings via two bridging oxideions, which gives a ferromagnetic nearest-neighbor interaction J_1 of -51 K andan antiferromagnetic next-nearest-neighbor interaction J_2 of 36 K in thechain. In contrast, a staggered d_{x2-y2} orbital arrangement in KCuMoO_4(OH)results in superexchange couplings via only one bridging oxide ion, which makesJ_1 antiferromagnetic as large as 238 K and J_2 negligible. This comparisonbetween the two isotypic compounds demonstrates an important role of orbitalarrangements in determining the magnetic properties of cuprates.

Orbital Arrangements and Magnetic Interactions in the Quasi-One-Dimensional Cuprates ACuMoO_4(OH) (A = Na, K)