Abstract
The photopyroelectric (PPE) technique is used to measure the specific heat of YBa2Cu3O7−X thin films. Hysteresis in the PPE amplitude is observed in the temperature range 90 K to 250 K. Peaks in the inverse PPE amplitude at T=110 K in the cooling path and at T≈230 K in the heating path are observed. The magnitude of hysteresis depends upon the thermal history of the sample.
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