Synthesis and Superconductivity of New Cuprates (Pb<subscript>0.8</subscript>W<subscript>0.2</subscript>)Sr<subscript>2</subscript>(Nd<subscript>1 − x</subscript>Ca<subscript> x</subscript>)Cu<subscript>2</subscript>O<subscript>7 − δ</subscript>.
In: Journal of Superconductivity, Jg. 11 (1998-12-01), Heft 6, S. 729-732
Online
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Zugriff:
New cuprates with nominal composition (Pb 0.8 W 0.2 )Sr 2 (Nd 1 − x Ca x )Cu 2 O 7 − δ (0≤ x≤1) were synthesized by solid-state reaction in N 2 . The crystal structure was characterized by X-ray powder diffraction (XRD) as tetragonal. Direct current electrical resistance measurements were applied to check the existence of superconductivity in these cuprates. Superconductivity with T c (onset) up to 82 K is observed when x = 0.6. Synthesis in N 2 is necessary in obtaining superconductivity in these cuprates. Preparation in air or post-treatment in flowing oxygen destroys superconductivity. A comparison is made with previous Pb-based 1212 superconducting oxides. The valence of Pb and the possible position of W in the lattice are discussed. [ABSTRACT FROM AUTHOR]
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Titel: |
Synthesis and Superconductivity of New Cuprates (Pb<subscript>0.8</subscript>W<subscript>0.2</subscript>)Sr<subscript>2</subscript>(Nd<subscript>1 − x</subscript>Ca<subscript> x</subscript>)Cu<subscript>2</subscript>O<subscript>7 − δ</subscript>.
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Autor/in / Beteiligte Person: | Zhao, Y. ; Qian, Y. ; Tang, K. ; Zhang, Y. |
Link: | |
Zeitschrift: | Journal of Superconductivity, Jg. 11 (1998-12-01), Heft 6, S. 729-732 |
Veröffentlichung: | 1998 |
Medientyp: | academicJournal |
ISSN: | 0896-1107 (print) |
DOI: | 10.1023/A:1022641123127 |
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