Transport properties of the oxides Y/sub 1/. sqrt. /sub x/Pr/sub x/Ba/sub 2/Cu/sub 3/O/sub 7/. sqrt. /sub delta/ (0less than or equal toxless than or equal to1): Effects of band filling and lattice distortion on superconductivity

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

OSTI ID:5220997

Goncalves, A P; Santos, I C; Lopes, E B; Henriques, R T; Almeida, M; Figueiredo, M O

The oxides with composition Y/sub 1/..sqrt../sub x/Pr/sub x/Ba/sub 2/(Cu/sub 3/O/sub 7/..sqrt../sub delta/)(0less than or equal toxless than or equal to1) 7-delta (0less than or equal toxless than or equal to1) are characterized by x-ray diffraction, resistivity (rho) and thermoelectric power (S) measurements. X-ray diffraction shows an orthorhombically distorted perovskite structure for all compositions, the pseudotetragonality increasing with x. The substitution of the tetravalent Pr for the trivalent Y atom increases the band filling in these materials. As a consequence, the superconducting transition temperature is progressively decreased with increasing x, and S significantly increases. Thermopower and resistivity measurements indicate that these oxides have relatively narrow bands and that the electronic correlations dominate their properties

• Research Organization: Departamento de Quimica, Instituto de Ciencias e Engenharia Nuclear(enLaboratorio Nacional de Engenharia e Technolgia Industrial P-2686 Sacavem Codex, Portugal
• OSTI ID: 5220997
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 37:13
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CRYSTAL STRUCTURE
THERMOELECTRIC PROPERTIES
COPPER OXIDES
PRASEODYMIUM OXIDES
YTTRIUM OXIDES
ELECTRIC CONDUCTIVITY
PARAMETRIC ANALYSIS
PEROVSKITES
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity