| Relation between high $T_c$ superconductivity and structure: a study of lanthanum barium copper oxide $(La_{3-x}Ba_{3+x}Cu_6O_{14+\delta})$ and yttrium barium copper oxide $(YBa_2Cu_3O_{7-\delta})$ systems (1987) | |||||||||
Abstract | |||||||||
| Superconductivity is found in tetragonal $La_3-xBa_3+xCu_6O_14+\delta$ and $(La, Ba)6-xSrxCu_6O_14+\delta$ even though these compds. do not possess $Cu$-$O$ chains or the $K_2NiF_4$ structure. Resistivity measurements confirm the occurrence of a transformation from chain-supercond. to sheet-supercond. in $YBa_2Cu_3O_7-\delta$ as \delta is varied in the range 0.0-0.5 | |||||||||
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