Pb substitution in the Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} high-T{sub c} superconductor: Cation overdoping

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.14717· OSTI ID:550547

Kendziora, C; Qadri, S B; Skelton, E ^[1]

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1. 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

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
MAGNETIC SUSCEPTIBILITY
RAMAN SPECTRA
STRONTIUM OXIDES
TRANSITION TEMPERATURE