EPR Study of Triplet Defects in Ca2CuO3

Ca2CuO3 is an essentially diamagnetic oxide, in spite of its EPR spectrum. The latter is similar to literature spectra attributed to dimers or clusters formed by copper ions. A model based on the formation of triplet-state defects involving two neighbor copper ions is then discussed to explain these experimental observations. These defects would also propagate in the crystal and interact with each other.