Kondo effect and superconductivity in Nd sub 2 minus x Ce sub x CuO sub 4 minus. delta. compounds
- Department of Physics, University of California-Davis, Davis, California 95616 (USA)
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (USA)
Samples of Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4{minus}{delta}} (0{le}{ital x}{le}0.2) were prepared by annealing both in air and under vacuum (10{sup {minus}5} Torr). Powder x-ray-diffraction patterns indicated that all samples consisted of a single-phase Nd{sub 2}CuO{sub 4}-type tetragonal structure with crystal symmetry {ital I}4/{ital mmm}. Electrical resistivity measurements showed that all Ce-doped Nd{sub 2}CuO{sub 4{minus}{delta}} samples annealed in air and those annealed in vacuum with {ital x}{lt}0.17 demonstrate a resistivity minimum (Kondo effect) resulting from the combination of magnetic and phonon scattering. Magnetic susceptibility and electrical resistivity measurements reflect the influence of crystal-field effects below 55 K. The linear temperature-dependent term of the resistivity typical of metallic behavior in the high-{ital T}{sub {ital c}} oxides exists across the whole range of Ce concentration, with the exception of the host compound Nd{sub 2}CuO{sub 4{minus}{delta}}, which is an insulator. This indicates that a model of metal-insulator transition is not appropriate in describing the occurrence of superconductivity in Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4{minus}{delta}}.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6963784
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:1; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANNEALING
ANTIFERROMAGNETISM
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL FIELD
CRYSTAL GROWTH METHODS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HEAT TREATMENTS
KONDO EFFECT
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
SCATTERING
SUBSTOICHIOMETRY
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
X-RAY DIFFRACTION