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Investigations of high-temperature superconductors and magnetic thin films

Thesis/Dissertation ·
OSTI ID:5633630
Magnetic, structural, and superconducting properties of three classes of Fe-doped high-temperature superconductors and magnetic properties in the surface regions of a thick Fe(110) layer with an MnF{sub 2} interface were studied. Fe doping in the GdBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} materials depresses the global superconducting transition temperature and destroys superconductivity in small regions localized around the Fe impurities. short-range spin correlations among the Cu spins are observed in these regions. As the oxygen content is gradually reduced, the short-range spin correlations evolve into a long-range 3D antiferromagnetic ordering. The magnetic dynamics of La{sub 2}CuO{sub 4} is studied, using the magnetic Fe{sup 3+} ions as a probe. The temperature dependence of the sublattice magnetization shows a 3D-2D dimensional crossover characteristic of a highly anisotropic antiferromagnet. The optimal compositions and sintering conditions for producing single-phase {approximately} {Kappa} Bi-Sr-Ca-Cu superconductors are explored. The Ca content is extremely important to the {approximately} 85 {Kappa} superconductivity. The anomalous quasilinear temperature dependence of magnetization is found to persist at least 13 monolayers into the interior of a thick Fe(110) layer with an MnF{sub 2} interface. The result is compared with a recent surface-anisotropy-based model.
Research Organization:
Johns Hopkins Univ., Baltimore, MD (United States)
OSTI ID:
5633630
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FILMS
FLUORIDES
FLUORINE COMPOUNDS
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HALIDES
HALOGEN COMPOUNDS
HIGH-TC SUPERCONDUCTORS
IRON
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANESE COMPOUNDS
MANGANESE FLUORIDES
MANGANESE HALIDES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
STRONTIUM
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS