Abstract
Ferromagnetic Mott–Hubbard insulator Lu 2V 2O 7 has been studied under continuous Ar laser irradiation. One of the photon energies, i.e. E=2.41 eV, corresponds to a transition from the lower Hubbard band of the V 3d orbital to the upper Hubbard band. Upon cooling, the activation-type electrical resistivity shows an anomalous drop within the temperature range of 70–130 K. Below the transition temperature, the resistivity shows no appreciable temperature dependence. The temperature increase due to the laser heating is estimated to be within the range of 15–35 K, which cannot be responsible for the observed anomalous drop of the resistivity. The metal–insulator transition is discussed in connection with the ferromagnetism of the present compound.
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