ISSN:
1572-9605
Keywords:
Oxygen chain disorder
;
hole density
;
effect of Ca
;
irreversibility line
;
stability of perovskite structure
;
Y(1-2-3) cuprates
;
substitution by Al, Fe, Co, Re, Ti
;
copper-apical oxygen
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Several M dopants such as Al, Fe, and Co at the Cu site destroy the superconductivity of YBa2Cu3O6+z . However, superconductivity is restored by substituting Ca at the Y site. Arguments are developed to show that the oxygen chain disorder is not the only cause for destroying the superconductivity. A universal relation seems to exist between the net hole density as a result of Ca substitution andT c . To stabilize the perovskite structure of YSr2Cu3O6+z , it is necessary to substitute Cu by certain elements. Examples are given on Ti and Re substitution. Again, Ca cosubstitution increasesT c . Further, the irreversibility line is enhanced by Ca, indicating improved pinning in these materials in spite of the oxygen disorder.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00730373
Permalink
