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Negative Differential Conductivity of Photoconducting KTaO3

N-type negative differential conductivity has been observed in photoconducting KTaO3 around 80 K. The state in which dI/dV is negative exists stably, and depends on the temperature and the light intensity. The photoconductivity decreases steeply with increase of temperature in the range from 70 K to 90 K. It is shown that the negative differential conductivity is caused by Joule heat.