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Aligia AA 《Physical review. B, Condensed matter》1993,47(22):15308-15311
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《Physics letters. A》1988,131(9):541-544
Temperature dependent ultrasonic attenuation data of polycrystalline YBa2Cu3O7 at 10 MHz show a plateau between 220 and 250 K, and slope changes at 263, 135 and 97 K. The attenuation does not display a sharp decrease at Tc as would be described in the BCS theory. Around 255 K, the sound velocity in the sample increases from its room temperature value by more than 10%. 相似文献