Abstract

Terahertz (THz) radiation from voltage-biased photoswitching devices made on magnetoresistive manganite ${\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_3$ have been investigated for thin films grown under different conditions. We find that the temperature dependence of THz radiation near the charge-ordering temperature strongly depends on the growth condition of ${\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_3$, whereas THz radiation shows no such temperature dependence near the spin-ordering temperature.

© 2004 Optical Society of America

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