Ultrasonic velocity and attenuation studies of REBaCuO superconductors
Identifieur interne : 001314 ( Istex/Checkpoint ); précédent : 001313; suivant : 001315Ultrasonic velocity and attenuation studies of REBaCuO superconductors
Auteurs : P. Venugopal Reddy [Inde] ; S. Shekhar [Inde]Source :
- Physica C: Superconductivity and its applications [ 0921-4534 ] ; 1993.
English descriptors
- KwdEn :
- Attenuation, Ceramic superconductors, Coarse grains, High superconducting transition temperature, Large number, Longitudinal, Longitudinal velocity, Phys, Present investigation, Shekhar, Sintered samples, Structural instabilities, Superconducting, Superconducting phase, Superconducting transition temperature, Superconductors, Temperature variation, Ultrasonic velocity, Venugopal reddy, Wang, Yening, Yening wang.
- Teeft :
- Attenuation, Ceramic superconductors, Coarse grains, High superconducting transition temperature, Large number, Longitudinal, Longitudinal velocity, Phys, Present investigation, Shekhar, Sintered samples, Structural instabilities, Superconducting, Superconducting phase, Superconducting transition temperature, Superconductors, Temperature variation, Ultrasonic velocity, Venugopal reddy, Wang, Yening, Yening wang.
Abstract
Abstract: Ultrasonic longitudinal velocity and attenuation studies of a few REBaCuO superconductors over a temperature range 80–300 K have been carried out by the pulse transmission technique. The longitudinal velocity of most of the samples is found to decrease with decreasing temperature, attaining a minimum value at temperatures between 150 and 100 K. In the superconducting phase the velocity of all the samples is found to remain almost constant. The anomalous velocity variation has been explained as due to the presence of the large number of coarse grains of sufficient size in the sintered samples. Attenuation versus temperature plots of the samples are found to exhibit three peaks in the temperature regions 200 K, 150 K and 100 K and a suitable explanation for the observed behaviour has also been offered.
Url:
DOI: 10.1016/0921-4534(93)90641-3
Affiliations:
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ISTEX:009E3BA7552F3FE6D240879116C9FDF12F6A2E03Le document en format XML
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<front><div type="abstract" xml:lang="en">Abstract: Ultrasonic longitudinal velocity and attenuation studies of a few REBaCuO superconductors over a temperature range 80–300 K have been carried out by the pulse transmission technique. The longitudinal velocity of most of the samples is found to decrease with decreasing temperature, attaining a minimum value at temperatures between 150 and 100 K. In the superconducting phase the velocity of all the samples is found to remain almost constant. The anomalous velocity variation has been explained as due to the presence of the large number of coarse grains of sufficient size in the sintered samples. Attenuation versus temperature plots of the samples are found to exhibit three peaks in the temperature regions 200 K, 150 K and 100 K and a suitable explanation for the observed behaviour has also been offered.</div>
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