We present a technique to experimentally determine the value of the temperature perturbation δT in photothermal microscopy. Knowledge of δT is necessary for proper analysis of the differential optical reflectivity (∂R/∂T) data obtained from untwinned Y1Ba2Cu3O7 crystals. We measure δT to be 0.2 K, consistent with previous theoretical predictions from thermal diffusion data.
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Studenmund et al. (1997) studied this question.
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