Ultrasonic velocity and attenuation studies of RE-Ba-Cu-O superconductors
Identifieur interne : 003476 ( Main/Exploration ); précédent : 003475; suivant : 003477Ultrasonic velocity and attenuation studies of RE-Ba-Cu-O superconductors
Auteurs : P. Venugopal Reddy [Inde] ; S. ShekharSource :
- Physica. C. Superconductivity [ 0921-4534 ] ; 1993.
Descripteurs français
- Pascal (Inist)
- Etude expérimentale, Propagation onde, Atténuation, Célérité son, Ultrason, Dépendance température, Domaine température 65-273 K, Supraconducteur haute température, Température transition, Matériau granulaire, Baryum oxyde, Cuivre oxyde, Yttrium oxyde, Samarium oxyde, Gadolinium oxyde, Terbium oxyde, Dysprosium oxyde, Thulium oxyde, 7425L, 7472D, Composé quaternaire, YBa2Cu3O7-delta, LnBa2Cu3O7-delta, Ba Cu O Y, Ba Cu Ln O.
English descriptors
- KwdEn :
- Attenuation, Barium oxides, Copper oxides, Dysprosium oxides, Experimental study, Gadolinium oxides, Granular materials, High-Tc superconductors, Quaternary compounds, Samarium oxides, Sound velocity, Temperature dependence, Temperature range 65-273 K, Terbium oxides, Thulium oxides, Transition temperature, Ultrasonic waves, Wave propagation, Yttrium oxides.
Abstract
Ultrasonic longitudinal velocity and attenuation studies of a few RE-Ba-Cu-O 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
Affiliations:
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Le document en format XML
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Shekhar</name></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">94-0032506</idno><date when="1993">1993</date><idno type="stanalyst">PASCAL 94-0032506 INIST</idno><idno type="RBID">Pascal:94-0032506</idno><idno type="wicri:Area/Pascal/Corpus">001872</idno><idno type="wicri:Area/Pascal/Curation">001872</idno><idno type="wicri:Area/Pascal/Checkpoint">001817</idno><idno type="wicri:explorRef" wicri:stream="Pascal" wicri:step="Checkpoint">001817</idno><idno type="wicri:doubleKey">0921-4534:1993:Venugopal Reddy P:ultrasonic:velocity:and</idno><idno type="wicri:Area/Main/Merge">003763</idno><idno type="wicri:Area/Main/Curation">003476</idno><idno type="wicri:Area/Main/Exploration">003476</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Ultrasonic velocity and attenuation studies of RE-Ba-Cu-O superconductors</title><author><name sortKey="Venugopal Reddy, P" sort="Venugopal Reddy, P" uniqKey="Venugopal Reddy P" first="P." last="Venugopal Reddy">P. Venugopal Reddy</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Osmania univ., dep. physics</s1><s2>Hyderabad 500 007</s2><s3>IND</s3></inist:fA14><country>Inde</country><wicri:noRegion>Hyderabad 500 007</wicri:noRegion></affiliation></author><author><name sortKey="Shekhar, S" sort="Shekhar, S" uniqKey="Shekhar S" first="S." last="Shekhar">S. Shekhar</name></author></analytic><series><title level="j" type="main">Physica. C. Superconductivity</title><title level="j" type="abbreviated">Phys., C Supercond.</title><idno type="ISSN">0921-4534</idno><imprint><date when="1993">1993</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Physica. C. Superconductivity</title><title level="j" type="abbreviated">Phys., C Supercond.</title><idno type="ISSN">0921-4534</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Attenuation</term><term>Barium oxides</term><term>Copper oxides</term><term>Dysprosium oxides</term><term>Experimental study</term><term>Gadolinium oxides</term><term>Granular materials</term><term>High-Tc superconductors</term><term>Quaternary compounds</term><term>Samarium oxides</term><term>Sound velocity</term><term>Temperature dependence</term><term>Temperature range 65-273 K</term><term>Terbium oxides</term><term>Thulium oxides</term><term>Transition temperature</term><term>Ultrasonic waves</term><term>Wave propagation</term><term>Yttrium oxides</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term><term>Propagation onde</term><term>Atténuation</term><term>Célérité son</term><term>Ultrason</term><term>Dépendance température</term><term>Domaine température 65-273 K</term><term>Supraconducteur haute température</term><term>Température transition</term><term>Matériau granulaire</term><term>Baryum oxyde</term><term>Cuivre oxyde</term><term>Yttrium oxyde</term><term>Samarium oxyde</term><term>Gadolinium oxyde</term><term>Terbium oxyde</term><term>Dysprosium oxyde</term><term>Thulium oxyde</term><term>7425L</term><term>7472D</term><term>Composé quaternaire</term><term>YBa2Cu3O7-delta</term><term>LnBa2Cu3O7-delta</term><term>Ba Cu O Y</term><term>Ba Cu Ln O</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Ultrasonic longitudinal velocity and attenuation studies of a few RE-Ba-Cu-O 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></front></TEI><affiliations><list><country><li>Inde</li></country></list><tree><noCountry><name sortKey="Shekhar, S" sort="Shekhar, S" uniqKey="Shekhar S" first="S." last="Shekhar">S. Shekhar</name></noCountry><country name="Inde"><noRegion><name sortKey="Venugopal Reddy, P" sort="Venugopal Reddy, P" uniqKey="Venugopal Reddy P" first="P." last="Venugopal Reddy">P. 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