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language
eng
Author
Taguchi, Isao
Asai, Masatoshi
Description
Resistivity and X-ray measurements have been done on ceramic samples which have nominal compositions of La_<2-x>A_xCaCu_2O_y or La_<2-x>A_xSrCu_2O_y (A=Ba and Ca). The samples with nominal compositions of La_<2-x>Ca_<1+x>Cu_2O_y (x=0.4) and La_<2-x>Ba_xCaCu_2O_y (x=0.2 and 0.4) are metallic but not superconducting down to 22 K. They are found to have the same crystal structure as that for La_2CaCu_20_6. However, when the amount of Ba doping is further increased, superconductivity appears near 80 K in samples with nominal compositions of La_<2-x>Ba_xCaCu_2O_y (x=1.0, 1.2 and 1.4). The X-ray results show that the superconductivity is not caused by the Ba doping but by a structural change to CaBaLaCu_3O_<7-δ> which is tetragonal at all temperatures.
Subject
high-T_c superconductor
La_2CaCu_20_y
CaBaLaCu_30_<7-δ>
Journal Title
Bulletin of Shimane Medical University
Volume
17
Start Page
57
End Page
61
ISSN
03879097
Published Date
1994-12-01
NCID
AN00107602
Publisher
島根医科大学
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Faculty of Medicine
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