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  • 1
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    Enhanced ultrasonic attenuation of Tl-Ca-Ba-Cu-O at the superconducting transition (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Temperature-dependent ultrasonic attenuation measurements have been performed on polycrystalline samples of Tl-Ca-Ba-Cu-O at various frequencies. An attenuation anomaly was observed close to the superconducting transition temperature T(c) (103 K) whose temperature position was frequency-independent. The attenuation decreased exponentially with temperature in the superconducting state for both transverse and longitudinal waves. It was also found that the temperature-dependent sound velocity showed a slope change around T(c).
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review B, 3rd Series (ISSN 0163-1829); 42; 2569-257
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Relaxation behavior of ultrasonic attenuation in YBa2Cu3O7 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: It is shown that temperature-dependent ultrasonic attenuation data of YBa2Cu3O7 at various frequencies exhibit anomalies at temperatures close to Tc. These attenuation maxima are found to be the result of a relaxation mechanism added on top of an unusual attenuation background. It is proposed that the grain boundary motions induced by the structural distortion and the propagation of sound waves enhances the energy dissipation around Tc. Whether this structural distortion is the consequence of the onset of a superconducting state remains undetermined. It is also possible that either a tunneling effect or the acoustoelectric effect contributes to sound energy dissipation. The temperature dependence of ultrasonic velocity shows a softening around Tc which may be an intrinsic property of high-temperature superconductors.
    Keywords: SOLID-STATE PHYSICS
    Type: IEEE Transactions on Magnetics (ISSN 0018-9464); 25; 2410-241
    Format: text
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    NASA TECHNICAL REPORTS
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