Anomalous temperature dependence of Hall coefficients for ( L sub 2/3 Ce sub 1/3 ) sub 4 (La sub 1/3 Ba sub 1/3 Sr sub 1/3 ) sub 4 Cu sub 6 O sub y ( L =Eu, Dy, Y, and Ho)
- Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13 Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan (JP)
The Hall effect in the temperature range between {ital T}{sub {ital c}} and 300 K was studied for new superconducting cuprates which have fluorite-type layers in the crystal structure. The samples studied were of (Nd,Ce){sub 2}CuO{sub 4} ({ital T}{prime} type), (Nd,Ce,Sr){sub 2}CuO{sub 4} ({ital T}{sup *} type), (Nd,Ce){sub 4}(Nd,Ba,Sr){sub 4}Cu{sub 6}O{sub {ital y}} (4:4:6 type) and ({ital L}, Ce){sub 4}(La,Ba,Sr){sub 4}Cu{sub 6}O{sub {ital y}} ({ital L}=Eu,Dy,Y,Ho,) (4:4:6 type). The Hall coefficients, {ital R}{sub {ital H}}, for all the samples exhibited maxima with respect to temperature, located around {ital T}{sub {ital p}}=110--150 K. This feature was not seen in the K{sub 2}NiF{sub 4}-type and 1:2:3-type superconductors in which {ital R}{sub {ital H}} increased rather monotonically with decreasing temperature. The maxima observed were not likely caused by the magnetic moment of the rare-earth elements, but by the fluorite-type layers contained in the {ital T}{prime}, {ital T}{sup *}, and 4:4:6 structures. For the ({ital L},Ce){sub 4}(La,Ba,Sr){sub 4}Cu{sub 6}O{sub {ital y}} system, a strong correlation between the magnitude of {ital T}{sub {ital c}} and the slope of {ital R}{sub {ital H}}-vs-{ital T} curve below {ital T}{sub {ital p}} was revealed. Both {ital T}{sub {ital c}} and {ital R}{sub {ital H}} were functions of the radius of Ln{sup 3+} contained in the fluorite layer.
- OSTI ID:
- 6883773
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Vol. 41:16; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
HALL EFFECT
CERIUM OXIDES
COPPER OXIDES
LANTHANUM OXIDES
NEODYMIUM OXIDES
STRONTIUM OXIDES
CRYSTAL STRUCTURE
CUPRATES
FLUORITE
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MEDIUM TEMPERATURE
TEMPERATURE DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CERIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDE MINERALS
HALIDES
HALOGEN COMPOUNDS
LANTHANUM COMPOUNDS
MINERALS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties