The optical response in single-crystal films of La0.67Ca0.33MnOδ(LCMO) is examined as a function of bias current, temperature, incident laser power, and light modulation frequency. The LCMO thin films are deposited on (110) NdGaO3substrates via a facing-target sputtering method. The sample is irradiated by a He-Ne laser to demonstrate the bolometric effect. The incident light power is attenuated by inserting neutral density filters. The sample is biased with a dc current. The optical response voltage across the sample is recorded by a lock-in amplifier. For highly resistive samples, the resistance measurements are conducted with a high impedance electrometer, and the optical response signal is extracted across a load resistance in series with the sample.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)