Thermoelectric power of the (Eu,Ce) sub 4 (Ba,Eu) sub 4 Cu sub 6 O sub y phase and the T sup * phase: Comparison between superconducting and nonsuperconducting compounds
- Superconductivity Research Laboratory, Interational Superconductivity Technology Center, 10-13 Shinonome 1-chome, Koto-ku, Tokyo 135, Japan (JP)
The Seebeck coefficient ({ital S}) and Hall coefficient ({ital R}{sub {ital H}}) are mea- sured in the temperature range 20--310 K for ({ital 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 {ital y}} (4:4:6 phase) with {ital L}=Eu (superconducting) and {ital L}=Y (nonsuperconducting), and Nd{sub 1.4}Ce{sub 0.2}Sr{sub 0.4}Cu{sub 1{minus}{ital x}}Zn{sub {ital x}}O{sub 4{minus}{delta}} ({ital T}{sup *} phase) with {ital x}=0 (superconducting) and {ital x}=0.015 (nonsuperconducting). In both the 4:4:6 phase and the {ital T}{sup *} phase, the {ital R}{sub {ital H}} of the nonsuperconducting compound is nearly the same as that of the superconducting compound, at temperatures higher than 150 K, but {ital S} of the nonsuperconducting compound is larger than that of the superconducting compound throughout the measured temperature range. This suggests that the contribution from carrier scattering to {ital S} is different in the nonsuperconducting and superconducting compounds. The temperature dependence of {ital S} for these compounds is compared with a theoretical prediction for the resonating-valence-bond state.
- OSTI ID:
- 5692148
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:13; ISSN 0163-1829; ISSN PRBMD
- 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
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHARGE CARRIERS
CHEMICAL BONDS
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
HALL EFFECT
LOW TEMPERATURE
MEDIUM TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
THERMOELECTRIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VALENCE
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES