Growth and properties of oxygen- and ion-doped Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8+. delta. single crystals

Journal Article · Sat Mar 31 23:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.6564· OSTI ID:7122571

Mitzi, D B; Lombardo, L W; Kapitulnik, A ^[1]; Laderman, S S; Jacowitz, R D ^[2]

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1. Department of Applied Physics, Stanford University, Stanford, California 94305 (USA)
2. Circuit Technology Research and Development, Hewlett-Packard Company, 3500 Deer Creek Road, Palo Alto, California 94304 (USA)

A directional solidification method for growing large single crystals in the Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} system is reported. Ion doping, with replacement of La for Sr and Y for Ca, as well as oxygen doping in these crystals has been explored. Doped and undoped crystals have been characterized using microprobe analysis, x-ray diffraction, thermogravimetric analysis, and magnetic and Hall measurements. Ion doping results in little change of the superconducting transition for substitution levels below 20--25%, while beyond this level the Meissner signal broadens and the low-temperature Meissner signal decreases. Microprobe analysis and x-ray diffraction performed on these more highly substituted single crystals provide evidence for inhomogeneity and phase segregation into regions of distinct composition. Annealing unsubstituted crystals in increasing partial pressures of oxygen reversibly depresses the superconducting transition temperature from 90 (as made) to 77 K (oxygen pressure annealed), while the carrier concentrations, as determined from Hall effect measurements, increase from {ital n}=3.1(3){times}10{sup 21} cm{sup {minus}3} (0.34 holes per Cu site) to 4.6(3){times}10{sup 21} cm{sup {minus}3} (0.50 holes per Cu site).

• OSTI ID: 7122571
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:10; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARRIER DENSITY
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL GROWTH
CRYSTALS
DIFFRACTION
DOPED MATERIALS
ELECTRON MICROSCOPY
ELEMENTS
ENERGY-LEVEL DENSITY
HALL EFFECT
LATTICE PARAMETERS
MATERIALS
MEISSNER-OCHSENFELD EFFECT
MICROSCOPY
MONOCRYSTALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION