Abstract
Terahertz (THz) radiation characteristics have been investigated for a dipole-type photoconducting switch fabricated on a charge-ordered manganite Pr 0.7Ca 0.3MnO 3 thin film. As the bias voltage is swept at a constant temperature of 125 K and a fixed laser power of 50 mW, we found a complete suppression of THz radiation, while the photocurrent returns to the original value with a hysteresis. We briefly discuss its interesting THz radiation characteristics related to the occurrence of photo-induced insulator–metal transition.
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