High temperature superconductivity in rare-earth (R)-barium copper oxides (RBa2) Cu3O9− σ
KN Yang, Y Dalichaouch, JM Ferreira, BW Lee… - Solid State …, 1987 - Elsevier
The series of rare-earth (R)-barium copper oxides with nominal composition (RBa 2) Cu 3 O
9− σ and the prototype compound (YBa 2) Cu 3 O 9− σ have been prepared from the R
(except Pm), Y, and Cu oxides and Ba carbonate by sintering, followed by arc-melting and
annealing in pure oxygen. X-ray diffraction measurements show that, except for R= Ce, Tb,
and Lu, the compounds have the perovskite-type structure reported by Cava et al. for high
superconducting transition temperature T c (YBa 2) Cu 3 O 9− σ. Electrical resistivity and …
9− σ and the prototype compound (YBa 2) Cu 3 O 9− σ have been prepared from the R
(except Pm), Y, and Cu oxides and Ba carbonate by sintering, followed by arc-melting and
annealing in pure oxygen. X-ray diffraction measurements show that, except for R= Ce, Tb,
and Lu, the compounds have the perovskite-type structure reported by Cava et al. for high
superconducting transition temperature T c (YBa 2) Cu 3 O 9− σ. Electrical resistivity and …
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