Substitution of transition metals for Cu in Bi{sub 2}(SrCa){sub n+2}Cu{sub n+1}O{sub y} whisker crystals: Fe and Pd
We have measured the resistive superconducting transition temperature of single-crystal whiskers of Bi{sub 2}(SrCa){sub n+2}(Cu{sub 1-x}M{sub x}){sub n+1}O{sub y} in which M represents the transition metals Fe and Pd that have been partially substituted for Cu. Combining these measurements with our earlier results for Co, Ni, and Zn substitutes, we derive a general relationship for the rate at which T{sub C} is depressed by substitution of transition metals: dT{sub C}/dx{approx}-780K for all these elements and both the 2212 (n=1) and 2223 (n=2) phases. Further, the normalized residual resistance is also a universal function of x. This is contrary to what others find for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO), in which Zn and Ni substitutions act quite differently on dT{sub C}/dx. The explanation of this effect in YBCO apparently does not involve the general behavior of the Cu-O planes. The magnitude of dT{sub C}/dx is about half that predicted by the Abrikosov-Gorkov relation, as seen in other Cu-O superconductors.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205590
- Journal Information:
- Physical Review B, Vol. 63, Issue 18; Other Information: DOI: 10.1103/PhysRevB.63.184515; Othernumber: PRBMDO000063000018184515000001; 037118PRB; PBD: 1 May 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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