Thermal diffusivity measurements for superconducting YBa2Cu3O7-x and Bi2Sr2CaCu2Ox are reported over the temperature range from 50 to 300 K. The results were obtained using frequency-modulated time-delay photopyroelectric spectrometry (FM-TDPS), which consists of chirped laster excitation of the sample and detection of the associated impulse by a thin-film pyroelectric detector.
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Peralta et al. (1991) studied this question.
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