Anisotropic superconducting properties of aligned (Bi,Pb) sub 2 Ca sub n minus 1 Sr sub 2 Cu sub n O sub 2 n +4+. delta. powders ( n =1,2,3) with T sub c =32, 94, and 110 K

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.13001· OSTI ID:5561991

Shi, J B; Chiou, B S ^[1]; Ku, H C ^[2]

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1. Institute of Electronics, National Chiao Tung University, Hsinchu, Taiwan 30039, Republic of China (CN)
2. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 30043, Republic of China (CN)

The anisotropic superconducting properties of aligned powders embedded in epoxy for bismuth copper oxides with the compositions (Bi{sub 1.6}Pb{sub 0.4})(Sr{sub 1.5}La{sub 0.5})CuO{sub 6+{delta}} ({ital n}=1, {ital T}{sub {ital c}}=32 K), Bi{sub 2}Ca{sub 1.2}Sr{sub 1.8}Cu{sub 2}O{sub 8+{delta}} ({ital n}=2, {ital T}{sub {ital c}}=94 K), and (Bi{sub 1.85}Pb{sub 0.15})Ca{sub 2.2}Sr{sub 1.8}Cu{sub 3}O{sub 10+{delta}} ({ital n}=3, {ital T}{sub {ital c}}=110 K) are reported. These {ital c}-axis-aligned samples were prepared in a 9.4-T applied magnetic field at room temperature. The temperature dependence of the anisotropy ratio {chi}{sub {ital c}}({ital T})/{chi}{sub {ital a}{ital b}}({ital T}) in the superconducting state is derived from both zero-field-cooled and field-cooled data using a small applied field {ital H} (less than or equal to the lower critical field {ital H}{sub {ital c}1}) parallel and perpendicular to the orthorhombic {ital c} axis. A highly anisotropic {chi}{sub {ital c}}/{chi}{sub {ital a}{ital b}} ratio was observed for all three systems, the maximum value of {chi}{sub {ital c}}/{chi}{sub {ital a}{ital b}}=9.8 at 5 K and 10.8 at 85 K for the 2:2:2:3 compound (Bi{sub 1.85}Pb{sub 0.15})Ca{sub 2.2}Sr{sub 1.8}Cu{sub 3}O{sub 10+{delta}} was observed. The field dependence of the anisotropy ratio {chi}{sub {ital c}}({ital H})/{chi}{sub {ital a}{ital b}}({ital H}) for the 2:1:2:2 compound Bi{sub 2}Ca{sub 1.2}Sr{sub 1.8}Cu{sub 2}O{sub 8+{delta}} up to 5 kG is discussed.

• OSTI ID: 5561991
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:16; ISSN PRBMD; ISSN 0163-1829
• 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
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIZATION
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE