Investigations of magnetic thin films and high- Tc superconductivity
Thesis/Dissertation
·
OSTI ID:5332967
Magnetic behavior of low dimensional systems was investigated through the study of two kind of materials: (1) Fe/Ag single-crystal thin films; (2) Fe doped high {Tc} superconductors. Samples of Fe(110)/Ag(111) thin films were fabricated by molecular beam epitaxy. By studying the spin-wave excitations at the interfaces of Fe/Ag/Fe sandwiches, the existence of magnetic interaction between the two Fe films across the Ag layer was proved. The relation between the spin-wave excitations and the coupling strength of the two ferromagnets was calculated by a Green's function method. An island structure in quasi-two-dimensional thin films and its influence to the magnetic properties were also studied. In the study of Fe-doped high-{Tc} superconductors of YBa{sub 2}(Cu{sup 1{minus}x}Fe{sub x}){sub 3}O{sub 7{minus}{delta}} with 0 {le} x {le} 0.15, the superconducting critical temperature {Tc} was found to be suppressed by the Fe doping and drops to zero at x {approx} 0.17. An orthorhombic-to-tetragonal structural transition occurs at x {approx} 0.03. The Fe dopants were found to occupy primarily at the Cu(1) sites ({approximately}90%) and the Fe-Fe interactions can establish a magnetic ordering at T = 4.2K for x > 0.03, which coexists with the superconductivity.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (United States)
- OSTI ID:
- 5332967
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
360601 -- Other Materials-- Preparation & Manufacture
360606 -- Other Materials-- Physical Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EPITAXY
FILMS
HIGH-TC SUPERCONDUCTORS
IRON
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
METALLURGICAL EFFECTS
METALS
MOLECULAR BEAM EPITAXY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SILVER
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
360601 -- Other Materials-- Preparation & Manufacture
360606 -- Other Materials-- Physical Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
EPITAXY
FILMS
HIGH-TC SUPERCONDUCTORS
IRON
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MATERIALS
METALLURGICAL EFFECTS
METALS
MOLECULAR BEAM EPITAXY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SILVER
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES