We have modified the electrical properties of rutile TiO2 with a 17 keV X-ray beam about 50x50 nm2 in size. We have drawn a conducting channel in an insulating matrix, guided the electroforming of a conducting filament and modified the rectifying properties of a Schottky barrier. We have also observed changes in the surface morphology and a more intense Raman activity in the irradiated regions. Computer simulations show that temperature spikes at the nanoscale are expected in correspondence with the synchrotron pulses, and preliminary measurements via single crystal X-ray diffraction confirm that local heating takes place during irradiation.
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