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A microscopic magnetic model of the low-pressure modification of CdVO3 isestablished, based on density functional theory (DFT) band-structurecalculations, magnetization measurements, and quantum Monte-Carlo simulations.This compound is a rare example of a quasi-one-dimensional spin-1/2 systemshowing exclusively ferromagnetic exchange. The spin lattice of CdVO3 entailszigzag chains with an effective intrachain coupling J ~ -90 K and interchaincouplings of Jc ~ -18 K and Ja ~ -3 K. Quantum fluctuations are partiallysuppressed by the sizable interchain coupling Jc that leads to an intermediateregime between one-dimensional and two-dimensional ferromagnetic systems. Apartfrom the peculiar spin model, CdVO3 features an unusual mechanism offerromagnetic superexchange. The couplings largely originate from Cd 5s statesmediating hoppings between half-filled and empty 3d states of V+4.

Unusual ferromagnetic superexchange in CdVO3: The role of Cd