Abstract
Photoacoustic amplitude and phase measurements have been carried out near the superconducting transition temperature in the highTcsuperconductor YBa2Cu3O7. In both the samples investigated, the photoacoustic phase undergoes an anomalous step-like decrease aroundTc≈ 96 K and increases at lower temperatures. A clear temperature hysteresis for the phase change has been noticed. No anomalous variation has been observed in the amplitude values. Neither phase nor amplitude shows any anomaly in a non-superconducting sample of the same composition.
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