Copper oxide superconductors
The properties of superconducting YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] thin films have been studied. Films have been prepared by multilayer deposition followed by ex situ furnace annealing. Deposition consists of a combination of dc triode sputtering from metallic targets of Y and Cu and thermal evaporation from a BaF[sub 2] source. Superconducting and structural properties of the films strongly depend on the annealing conditions. Several heat treatment cycles were investigated, as well as different compositions. Best results were obtained for films deposited on (100) SrTiO[sub 3] substrates, exhibiting T[sub c](onset) as high as 92 K and zero resistance by 85 K. The second part of this dissertation examines the properties of ceramic Nd[sub 2[minus]x]Ce[sub x]CuO[sub 4[minus][delta]] and Nd[sub 1.85]Ce[sub 0.15](Cu[sub 1[minus]y]Zn[sub y])O[sub 4[minus][delta]] bulk samples. Superconducting properties are examined as a function of x and y. Accurate ([+-]0.001 [angstrom]) lattice parameter calculations are performed from experimental x-ray diffraction data. Comparisons with previous zinc-doping studies in the hole superconducting material L[sub 1.85]Sr[sub 0.15]CuO[sub 4[minus][delta]] are made. Theoretical implications and the question of electron-hole symmetry in the copper oxide superconductors are also discussed.
- Research Organization:
- Arizona Univ., Tucson, AZ (United States)
- OSTI ID:
- 7072746
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
SYNTHESIS
ANNEALING
BARIUM OXIDES
CERIUM OXIDES
COPPER OXIDES
NIOBIUM OXIDES
THIN FILMS
YTTRIUM OXIDES
ZINC OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CERIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
FILMS
HEAT TREATMENTS
NIOBIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZINC COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)