Kondo effect and superconductivity in Nd2-xCexCuO4-δ compounds
Creators
- 1. Department of Physics, University of California-Davis, Davis, California 95616 (USA)
- 2. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (USA)
Description
Samples of Nd2-xCexCuO4-δ (0≤x≤0.2) were prepared by annealing both in air and under vacuum (10-5 Torr). Powder x-ray-diffraction patterns indicated that all samples consisted of a single-phase Nd2CuO4-type tetragonal structure with crystal symmetry I4/mmm. Electrical resistivity measurements showed that all Ce-doped Nd2CuO4-δ samples annealed in air and those annealed in vacuum with x<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-Tc oxides exists across the whole range of Ce concentration, with the exception of the host compound Nd2CuO4-δ, which is an insulator. This indicates that a model of metal-insulator transition is not appropriate in describing the occurrence of superconductivity in Nd2-xCexCuO4-δ
Additional details
Publishing Information
- Journal Title
- Physical Review, B: Condensed Matter
- Journal Volume
- 41
- Journal Issue
- 1
- Series
- Phys. Rev., B: Condens. Matter.
- Journal Page Range
- 187-192
- ISSN
- 0163-1829
- CODEN
- PRBMD
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 21057572
- Subject category
- S36: MATERIALS SCIENCE; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ANNEALING; ANTIFERROMAGNETISM; CERIUM OXIDES; COPPER OXIDES; CRYSTAL FIELD; CRYSTAL GROWTH; ELECTRIC CONDUCTIVITY; KONDO EFFECT; LOW TEMPERATURE; MAGNETIC SUSCEPTIBILITY; NEODYMIUM OXIDES; QUANTITY RATIO; SUBSTOICHIOMETRY; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE; X-RAY DIFFRACTION
- Descriptors DEC
- CERIUM COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; COPPER COMPOUNDS; DIFFRACTION; ELECTRICAL PROPERTIES; HEAT TREATMENTS; MAGNETIC PROPERTIES; MAGNETISM; NEODYMIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS