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Zero temperature coefficient of resistivity induced by photovoltaic effect in Y Ba2
15.F. Yang, M. Y. Han, and F. G. Chang, “Origin of photovoltaic effect in superconducting Y Ba2Cu3O6.96 ceramics,” to be published.
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characteristics of YBCO-Ag system under blue laser (λ = 450 nm) illumination were studied from 100 to 300 K and obvious photovoltaic
effects were observed. All the I-V curves in the temperature range intersect at a point in the first quadrant while the laser points to the cathode electrode, indicating a zero temperature coefficient of resistivity. This implies that the outputting voltage keeps constant in a broad temperature range when a critical bias current is assigned. The intersection points of different laser intensities fall in a straight line, the slope of which (R
c) is independent of temperature and laser intensity.
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