Occurrence of maximum T c at an optimal carrier concentration in superconducting bismuth and thallium cuprates

29 January 1990

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 56 (5) , 487-489
https://doi.org/10.1063/1.103296

Abstract

The superconducting transition temperatures in Bi₂Ca_1−xLn_xSr₂Cu₂O_8+δ, TlCa_1−xLn_xSr₂Cu₂O_6+δ, and Tl_0.8Ca_1−xLn_xBa₂Cu₂₃O_6+δ (Ln=Y or rare earth) vary with composition and show a maximum at a specific value of x or δ. This observation suggests that an optimal carrier concentration is required to attain maximum T_c in such cuprates which seem to be two‐band systems.

Keywords

This publication has 7 references indexed in Scilit:

Superconducting (1:1:2:2)-type layered cuprates of the formula ${TlCA}_{1 - x}$ $L_{x}$ ${Sr}_{2}$ ${Cu}_{2}$ $O_{y}$ (L=Y or rare-earth element)
Physical Review B, 1989
Neutron diffraction evidence for oxygen dimers in Bi-Ca-Sr-Cu-O superconductors
Physica C: Superconductivity and its Applications, 1989
Structural aspects of high-temperature cuprate superconductors
Accounts of Chemical Research, 1989
Bismuth cuprate high- $T_{c}$ superconductors using cationic substitution
Physical Review B, 1989
Increased T c of bismuth strontium calcium copper oxide superconductor by praseodymium substitution
Applied Physics Letters, 1989
Chemistry of High-Temperature Superconductors
Science, 1988
Absorption of electromagnetic radiation by superconducting YBa₂Cu₃O₇: an oxygen-induced phenomenon
Journal of Physics C: Solid State Physics, 1987