Scaling of the thermoelectric power in a wide temperature range in Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital x}}Nd{sub {ital x}}Cu{sub 2}O{sub {ital y}} ({ital x}=0{endash}0.5): Experiment and interpretation

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.905· OSTI ID:434523

Gasumyants, V E ^[1]; Ageev, N V; Vladimirskaya, E V; Smirnov, V I; Kazanskiy, A V ^[2]; Kaydanov, V I ^[3]

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1. Physique des Solides, Code Postale 233, Universite Libre de Bruxelles, B-1050 Bruxelles (Belgium)
2. Department of Physics of Semiconductors, St. Petersburg Technical University, 29 Politechnicheskaya, St. Petersburg, 195251 (Russia)
3. Department of Physics, Colorado School of Mines, Golden, Colorado 80401 (United States)

We report measurements of the thermopower ({ital S}) in the temperature range from {ital T}{sub {ital c}} up to 1000 K, as well as of the resistivity and the Hall coefficient for temperatures up to {ital T}=300 K of single-phase Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital x}}Nd{sub {ital x}}Cu{sub 2}O{sub {ital y}} compounds with 0{le}{ital x}{le}0.5. It was found that the {ital S}({ital T}) dependences in the normal state have three regions of different thermopower behavior. In the first region, at low temperature ({ital T}{lt}100{endash}220 K), the {ital S}({ital T}) curves have a smooth maximum, which shifts to higher temperature as {ital x} increases. Then, as the temperature increases, there is an extended second region where {ital S} decreases nearly linearly with {ital T}. Finally, in the third region, at high temperature ({ital T}{approx_gt}620 K), the thermopower demonstrates a temperature-independent behavior for all the investigated samples. The temperature of the crossover from the second {ital S}({ital T}) region to the third one is unchanged with {ital x}. The results are discussed in the framework of a phenomenological band spectrum model. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 434523
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
HALL EFFECT
HIGH-TC SUPERCONDUCTORS
NEODYMIUM OXIDES
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
THERMOELECTRIC PROPERTIES