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

Journal Article · Wed May 01 04:00:00 UTC 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.11508· OSTI ID:5692148

Ikegawa, S; Wada, T; Yamashita, T; Ichinose, A; Matsuura, K; Kubo, K; Yamauchi, H; Tanaka, S ^[1]

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1. 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

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
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CERIUM OXIDES
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CHARGE CARRIERS
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THERMOELECTRIC PROPERTIES
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