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In2VO5, containing magnetically frustrated zig-zag chains, shows a remarkablemagnetic crossover at 120 K between paramagnetic states with positive (17 K)and negative (-70 K) Weiss temperatures. Magnetic moment and entropy data showthat the V4+ S = 1/2 spins condense into S = 1 triplet dimers below thecrossover. A further freezing of the antiferromagnetically coupled tripletdimers into a global singlet state is observed at 2.5 K, with no long rangemagnetic order down to 0.42 K and in fields up to 9 T. No structural V-Vdimerization is observed by high-resolution X-ray diffraction down to 10 K, buta subtle lattice anomaly evidences a spin-lattice coupling in the triplet dimerstate. This is assigned to longitudinal oxygen displacement modes that reducefrustration within the chains and so couple to the spin dimer fluctuations.

Triplet Dimerization Crossover Driven by Magnetic Frustration in In2VO5