High resistivity TiO2 nanostructured films exhibit photovoltaic dc voltages within the range1–10mVwith strong sensitivity to low energy radiation. Close similarities of these dc photovoltages with those related to Josephson coupling in granular films and high-Tc cuprates suggest large infrared photon absorption with pair transitions between superconducting grains. We give theoretical support to the existence of a high-Tc state within the TiO2 grains which can be the basis of resonant radiation absorption through Josephson intergrain coupling.
Josephson effect in TiO2 nanostructured films
DALLACASA, Valerio
2006-01-01
Abstract
High resistivity TiO2 nanostructured films exhibit photovoltaic dc voltages within the range1–10mVwith strong sensitivity to low energy radiation. Close similarities of these dc photovoltages with those related to Josephson coupling in granular films and high-Tc cuprates suggest large infrared photon absorption with pair transitions between superconducting grains. We give theoretical support to the existence of a high-Tc state within the TiO2 grains which can be the basis of resonant radiation absorption through Josephson intergrain coupling.
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