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Anomalous photovoltaic response in YBa2Cu3O7.

Several experiments were carried out to study the origin of the anomalous photovoltaic effect in high-quality YBa 2 Cu 3 O 7 thin films. In particular, the issue of whether the signal is induced by thermal gradients was addressed. Using samples with well-characterized orientation and texture, and using low-power cw lasers, it was determined that the signal was proportional to the thermal gradient along the c axis. However the magnitude of the signal was more than 10 times larger than that produced by thermoelectric power