Study of the peak effect in pure, Pb and Pb + Y doped Bi-2212 single crystals
Identifieur interne : 00CA22 ( Main/Merge ); précédent : 00CA21; suivant : 00CA23Study of the peak effect in pure, Pb and Pb + Y doped Bi-2212 single crystals
Auteurs : X. L. Wang [Australie] ; H. K. Liu [Australie] ; S. X. Dou [Australie]Source :
- Physica. C. Superconductivity and its applications
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- Pascal (Inist)
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Abstract
The peak effect (PE) in pure, Pb and Pb + Y doped Bi2212 single crystals with different oxygen doping levels was studied by measuring M-H loops over a wide temperature range. The PE in pure Bi2212 crystals was obtained only for crystals with optimal oxygen doping and over-doping but not observed for oxygen under-doped crystals. For Pb doped Bi2212 crystals, the PE appeared at a higher field than in the pure crystals and persisted up to Tc. For (Bi1.64Pb0.36)Sr2Ca1-xYxCu2O8+y (x = 0, 0.05, 0.11, 0.33) single crystals, results show that at low temperatures, the peak field is smaller than in solely Pb doped crystals and decreases as x increases (x > 0.1). However, the peak field at high temperature for the x = 0.05 sample is higher than for heavily Pb doped Bi2212 crystals, indicative of strong pinning due to the co-doping. The formation of Bi5+ rich clusters, which cause the reduction of the c-axis lattice parameter and ρc, is proposed to be responsible for the appearance of the PE in the undoped crystals. The co-existence of Pb4+- and Bi5+-rich clusters causes the strong PE in Pb doped Bi2212 crystals. Y3+ is proposed to be an effective dopant at low doping levels for flux pinning at high temperatures. The PE for all the crystals was characterised by plotting (Hmax -Hmin)/Hmax vs T/Tc, where Hmin and Hmax represent the fields at which the magnetisation starts to increase (Hmin) and reaches a maximum (Hmax) at the peak position. Results showed that the evolution of the peak effect with temperature in the Pb and Pb + Y doped crystals was similar to that seen in Y123.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Study of the peak effect in pure, Pb and Pb + Y doped Bi-2212 single crystals</title><author><name sortKey="Wang, X L" sort="Wang, X L" uniqKey="Wang X" first="X. L." last="Wang">X. L. Wang</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Superconducting and Electronic Materials, University of Wollongong</s1><s2>Wollongong, NSW 2522</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Wollongong, NSW 2522</wicri:noRegion></affiliation></author><author><name sortKey="Liu, H K" sort="Liu, H K" uniqKey="Liu H" first="H. K." last="Liu">H. K. Liu</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Superconducting and Electronic Materials, University of Wollongong</s1><s2>Wollongong, NSW 2522</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Wollongong, NSW 2522</wicri:noRegion></affiliation></author><author><name sortKey="Dou, S X" sort="Dou, S X" uniqKey="Dou S" first="S. X." last="Dou">S. X. Dou</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Superconducting and Electronic Materials, University of Wollongong</s1><s2>Wollongong, NSW 2522</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Wollongong, NSW 2522</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">02-0206085</idno><date when="2001">2001</date><idno type="stanalyst">PASCAL 02-0206085 INIST</idno><idno type="RBID">Pascal:02-0206085</idno><idno type="wicri:Area/PascalFrancis/Corpus">005826</idno><idno type="wicri:Area/PascalFrancis/Curation">000913</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">005677</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">005677</idno><idno type="wicri:Area/Main/Merge">00CA22</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Study of the peak effect in pure, Pb and Pb + Y doped Bi-2212 single crystals</title><author><name sortKey="Wang, X L" sort="Wang, X L" uniqKey="Wang X" first="X. L." last="Wang">X. L. Wang</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Superconducting and Electronic Materials, University of Wollongong</s1><s2>Wollongong, NSW 2522</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Wollongong, NSW 2522</wicri:noRegion></affiliation></author><author><name sortKey="Liu, H K" sort="Liu, H K" uniqKey="Liu H" first="H. K." last="Liu">H. K. Liu</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Superconducting and Electronic Materials, University of Wollongong</s1><s2>Wollongong, NSW 2522</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Wollongong, NSW 2522</wicri:noRegion></affiliation></author><author><name sortKey="Dou, S X" sort="Dou, S X" uniqKey="Dou S" first="S. X." last="Dou">S. X. Dou</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute for Superconducting and Electronic Materials, University of Wollongong</s1><s2>Wollongong, NSW 2522</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Wollongong, NSW 2522</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Physica. C. Superconductivity and its applications</title></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Physica. C. Superconductivity and its applications</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bismuth oxides</term><term>Calcium oxides</term><term>Composition effect</term><term>Copper oxides</term><term>Experimental study</term><term>Flux pinning</term><term>High-Tc superconductors</term><term>Lead oxides</term><term>Magnetic hysteresis</term><term>Magnetization</term><term>Monocrystals</term><term>Nonstoichiometry</term><term>Peak effect</term><term>Strontium oxides</term><term>Temperature dependence</term><term>Yttrium oxides</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Effet pic</term><term>Non stoechiométrie</term><term>Hystérésis magnétique</term><term>Dépendance température</term><term>Aimantation</term><term>Effet composition</term><term>Ancrage flux</term><term>Supraconducteur haute température</term><term>Monocristal</term><term>Bismuth oxyde</term><term>Calcium oxyde</term><term>Plomb oxyde</term><term>Cuivre oxyde</term><term>Strontium oxyde</term><term>Yttrium oxyde</term><term>Etude expérimentale</term><term>7425H</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The peak effect (PE) in pure, Pb and Pb + Y doped Bi2212 single crystals with different oxygen doping levels was studied by measuring M-H loops over a wide temperature range. The PE in pure Bi2212 crystals was obtained only for crystals with optimal oxygen doping and over-doping but not observed for oxygen under-doped crystals. For Pb doped Bi2212 crystals, the PE appeared at a higher field than in the pure crystals and persisted up to T<sub>c</sub>. For (Bi<sub>1.64</sub>Pb<sub>0.36</sub>)Sr<sub>2</sub>Ca<sub>1-x</sub>Y<sub>x</sub>Cu<sub>2</sub>O<sub>8+y</sub> (x = 0, 0.05, 0.11, 0.33) single crystals, results show that at low temperatures, the peak field is smaller than in solely Pb doped crystals and decreases as x increases (x > 0.1). However, the peak field at high temperature for the x = 0.05 sample is higher than for heavily Pb doped Bi2212 crystals, indicative of strong pinning due to the co-doping. The formation of Bi<sup>5+</sup> rich clusters, which cause the reduction of the c-axis lattice parameter and ρ<sub>c</sub>, is proposed to be responsible for the appearance of the PE in the undoped crystals. The co-existence of Pb<sup>4+</sup>- and Bi<sup>5+</sup>-rich clusters causes the strong PE in Pb doped Bi2212 crystals. Y<sup>3+</sup> is proposed to be an effective dopant at low doping levels for flux pinning at high temperatures. The PE for all the crystals was characterised by plotting (H<sub>max</sub> -H<sub>min</sub>)/H<sub>max</sub> vs T/T<sub>c</sub>, where H<sub>min</sub> and H<sub>max</sub> represent the fields at which the magnetisation starts to increase (H<sub>min</sub>) and reaches a maximum (H<sub>max</sub>) at the peak position. Results showed that the evolution of the peak effect with temperature in the Pb and Pb + Y doped crystals was similar to that seen in Y123.</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Wang, X L" sort="Wang, X L" uniqKey="Wang X" first="X. L." last="Wang">X. L. Wang</name></noRegion><name sortKey="Dou, S X" sort="Dou, S X" uniqKey="Dou S" first="S. X." last="Dou">S. X. Dou</name><name sortKey="Liu, H K" sort="Liu, H K" uniqKey="Liu H" first="H. K." last="Liu">H. K. Liu</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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