Photoacoustic study of CsPbCl3 crystals
نویسنده
چکیده
Photoacoustic (PA) signals of CsPbCl3 crystals have been examined in a wide temperature range of 150–300 K. The PA signals, induced by ns-pulsed laser excitation of electronic states and detected with a piezoelectric transducer, are thermoelastic ultrasonic waves lasting for hundreds of microseconds. The wavelet analysis of the PA wave has clarified that the thermoelastic wave includes several MHz components. The PA signals have been also made use of in order to examine phase transitions at low temperatures in the crystal. Changes of PA signals strongly suggest that second-order phase transitions take place at low temperatures around 200 K.
منابع مشابه
Photoacoustic detection of phase transitions at low temperatures in CsPbCl3 crystals
Phase transitions in CsPbCl3 crystals have been explored by photoacoustic (PA) method in a wide temperature range of 150–300 K. The PA signals, induced by ns-pulsed laser excitation of electronic states and detected with a piezoelectric transducer, are thermoelastic ultrasonic waves lasting for hundreds of microseconds. The wavelet analysis of the PA wave has clarified that the thermoelastic wa...
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