Reversible and bistable terahertz radiation from magnetoresistive Pr[sub 0.7]Ca[sub 0.3]MnO[sub 3] thin films

Kida, Noriaki; Tonouchi, Masayoshi
May 2003
Applied Physics Letters;5/19/2003, Vol. 82 Issue 20, p3412
Academic Journal
Reversible and bistable terahertz (THz) radiation by sweeping the temperature has been observed in a dipole-type photoswitching device fabricated on magnetoresistive charge-ordered manganite Pr[sub 0.7]Ca[sub 0.3]MnO[sub 3] thin film. Based on simultaneous measurements of the photocurrent, we show that this THz functionality of Pr[sub 0.7]Ca[sub 0.3]MnO[sub 3] arises from the instability of metallic patches embedded with a charge-ordered insulating phase, which is created by the illumination of visible light under an electric field at constant temperature, and that it can also be controlled by a subsequent change of temperature.


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