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), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:16; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CUPRATES
FLUORIDES
FLUORINE COMPOUNDS
FLUORITE
HALIDE MINERALS
HALIDES
HALL EFFECT
HALOGEN COMPOUNDS
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
MEDIUM TEMPERATURE
MINERALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS