Thermoelectric power of YBa sub 2 Cu sub 3 O sub 7 minus. delta. : Phonon drag and multiband conduction

Journal Article · Mon Feb 25 04:00:00 EST 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.1098· OSTI ID:5735031

Cohn, J L; Wolf, S A ^[1]; Selvamanickam, V; Salama, K ^[2]

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1. Materials Physics Branch, Naval Research Laboratory, Washington, D.C. 20375 (USA)
2. Texas Center for Superconductivity at University of Houston, Houston, Texas 77004 (USA)

We report measurements of the {ital a}-{ital b}-plane thermopower ({ital S}) on crystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} ({delta}{le}0.16) for temperatures below 310 K. Much sharper features in the {ital T} dependence of {ital S} are observed than have been previously reported. Both the temperature and oxygen-doping dependences of {ital S}, which have caused confusion, are consistently accounted for by conventional metallic theory for the first time. Strong phonon drag and two carrier species are indicated, with holes on the planes and electrons on the chains. An anomalous, positive component to {ital S}, observed for {ital T}{lt}160 K, is attributed to a freeze-out of carrier-phonon umklapp processes involving holes in the CuO{sub 2} planes and optical-mode phonons.

• OSTI ID: 5735031
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:8; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BASIC INTERACTIONS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DATA
ELECTRICITY
ELECTROMAGNETIC INTERACTIONS
ELECTRONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HIGH-TC SUPERCONDUCTORS
HOLES
INFORMATION
INTERACTIONS
LEPTONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
NUMERICAL DATA
OXIDES
OXYGEN ADDITIONS
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMOELECTRICITY
TRANSITION ELEMENT COMPOUNDS
UMKLAPP PROCESSES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES