Abstract
Magnetic and transport properties of the transition metal bronzes are determined by the extent of delocalization of the transition metal 4d-electrons. We report on ESR investigations of single crystals of the “red” potassium molybdenum bronze K0.33MoO3 and of the “blue” potassium molybdenum bronze K0.30MoO3. ESR spectra due to unpairedd-electrons are observed at both compounds. Analyzing the hyperfine structure we find that thed1-electrons are delocalized over six molybdenum lattice sites in semiconducting K0.33MoO3. The same K0.33MoO3 crystals show another spectrum which is caused by pairs of exchange coupledd-electrons. Our results are compared with those from magnetic susceptibility measurements and are discussed in connection with the crystal structure of K0.33MoO3 and K0.30MoO3.
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