Positive Hall coefficient observed in single-crystal Nd sub 2 minus x Ce sub x CuO sub 4 minus. delta. at low temperatures
- Joseph Henry Laboratories of Physics, Princeton University, Princeton, New Jersey 08544 (US)
- Bell Communications Research, 331 Newman Spring Road, Red Bank, New Jersey 07701 (USA)
The Hall coefficient {ital R}{sub {ital H}} has been measured in superconducting single crystals of Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4{minus}{delta}}({ital x}{similar to}0.15). Although {ital R}{sub {ital H}} is sample dependent in sign above {similar to}100 K, it increases steeply to {ital positive} values in all crystals studied below {similar to}80 K. {ital R}{sub {ital H}} remains {ital T} (temperature) dependent at 2 K, in contrast to the resistivity {rho}{sub {ital a}} which saturates to a constant below 30 K. Using a two-band model, we account for the observed profiles of {ital R}{sub {ital H}} vs {ital T} and {rho}{sub {ital a}} vs {ital T}. The analysis reveals that the scattering processes for the electronlike and holelike bands have vastly different temperature scales. The hole-scattering rate remains {ital T} dependent to 2 K. The question whether the hole or the electron quasiparticles are responsible for the superconductivity in Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4{minus}{delta}} is discussed.
- OSTI ID:
- 5734870
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:4; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HALL EFFECT
HIGH-TC SUPERCONDUCTORS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE