Resistive and magnetic studies of Nd/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/. sqrt. /sub delta/ and Pr/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/. sqrt. /sub delta/

Journal Article · Sun May 01 04:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.7454· OSTI ID:5255443

Chittipeddi, S; Song, Y; Cox, D L; Gaines, J R; Golben, J P; Epstein, A J

We report resistivity, structural, and magnetic susceptibility (chi/sup spin/(T)) measurements for the compounds Pr/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta/ and Nd/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta/. The Nd compound is superconducting with an onset transition temperature of 90 K, while the Pr compound is semiconducting above 4 K. The lattice parameters for these two materials have been determined using x-ray diffraction techniques, and both appear to be tetragonal, although the Nd/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta/ compound may exhibit some orthorhombic splitting. The high-temperature effective moments in the two systems are within a few percent of the free-ion moments. In each case the presence of significant curvature in the inverse susceptibility versus T behavior on the scale of 100 K suggests the presence of crystalline electric field splittings on the same energy scale. For the Pr compound this is further confirmed by a finite value for chi/sup spin/(0) and a residual large constant term at high temperatures. The possible origin of semiconducting behavior as compared with superconducting behavior in the Nd and other rare-earth compounds is discussed in terms of differences in charge-carrier density and possible role of valence fluctuations among Pr rare-earth ions

• Research Organization: Department of Physics, The Ohio State University, Columbus, Ohio 43210
• OSTI ID: 5255443
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:13; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CARRIER DENSITY
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL FIELD
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FLUCTUATIONS
LATTICE PARAMETERS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
MICROSCOPY
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SEMICONDUCTOR MATERIALS
SUPERCONDUCTIVITY
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
VALENCE
VARIATIONS
X-RAY DIFFRACTION