Pb substitution in the Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} high-T{sub c} superconductor: Cation overdoping
- Naval Research Laboratory, Washington, DC 20375 (United States)
We study the effects of Pb substitution in single crystals of the high-temperature superconductor Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. We compare Pb-substituted samples with {open_quotes}pure{close_quotes} (unsubstituted) crystals in terms of structure, cation composition, and the temperature dependences of ac susceptibility and Raman scattering. We find that Pb{sup 2+} primarily substitutes for Bi{sup 3+}, leading directly to a T{sub c} reduction characteristic of overdoped samples. We also observe structural changes related to the superlattice modulation along b*. Raman scattering studies indicate that some Pb atoms go to Sr sites. Low-temperature electronic Raman scattering shows further evidence for cation overdoping by comparison with oxygen annealed pure Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}.
- OSTI ID:
- 550547
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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