Synthesis and superconductivity of new cuprates (Pb0.8W0.2)Sr-2(Nd1-xCax)Cu2O7-delta

Citation
Yd. Zhao et al., Synthesis and superconductivity of new cuprates (Pb0.8W0.2)Sr-2(Nd1-xCax)Cu2O7-delta, J SUPERCOND, 11(6), 1998, pp. 729-732
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SUPERCONDUCTIVITY
ISSN journal
0896-1107 → ACNP
Volume
11
Issue
6
Year of publication
1998
Pages
729 - 732
Database
ISI
SICI code
0896-1107(199812)11:6<729:SASONC>2.0.ZU;2-J
Abstract
New cuprates with nominal composition (Pb0.8W0.2)Sr-2(Nd1-xCax)Cu2O7-delta( 0 less than or equal to x less than or equal to 1) were synthesized by soli d-state reaction in N-2. The crystal structure was characterized by X-ray p owder diffraction (XRD) as tetragonal. Direct current electrical resistance measurements were applied to check the existence of superconductivity in t hese cuprates. Superconductivity with T-c (onset) up to 82 K is observed wh en x = 0.6. Synthesis in N-2 is necessary in obtaining superconductivity in these cuprates. Preparation in air or post-treatment in flowing oxygen des troys superconductivity. A comparison is made with previous Ph-based 1212 s uperconducting oxides. The valence of Pb and the possible position of W in the lattice are discussed.