sup 17 O NMR relaxation studies of oxide superconductors

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5546986

Reven, L

In this study, solid state nuclear magnetic resonance (NMR) spectroscopy is used to investigate the structural, electronic, and dynamical properties of a variety of high temperature oxide superconductors and metal carbonyls adsorbed on metal oxide surface. The first five chapters describe the {sup 17}O Knight shift, nuclear spin lattice and spin-spin relaxation measurements carried out on a large number of cuprate, bismuthate and plumbate superconductors. After briefly reviewing the basic theory of the NMR parameters of metals in the normal and superconducting states, a detailed {sup 17}O NMR study of YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}, is described in Chapter 2. Chapter 3 contains a comparative study of Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8+x}, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x}, YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}, and La{sub 1.85}Sr{sub 0.15}CuO{sub 4} are compared to the theoretical model of Monien, Millis, and Pines of an antiferromagnetic Fermi liquid state. In Chapter 4, it is shown that the normal state nuclear spin lattice relaxation behavior of the copper-free superconductors can be accounted for by a simple p conduction band model. The {sup 17}O NMR results for the different families of oxide superconductors are summarized in Chapter 5. The {sup 17}O NMR parameters of the bismuthate and plumbate superconductors show these materials to be weakly metallic oxides with T{sub 1}T values which are consistent with a BCS-like relationship between the electronic density of states and T{sub c}. The normal state of the cuprate superconductors display properties consistent with the presence of magnetic interactions and their T{sub 1}T values show little variation with T{sub c}.

• Research Organization: Illinois Univ., Urbana, IL (United States)
• OSTI ID: 5546986
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COMPARATIVE EVALUATIONS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EVALUATION
EVEN-ODD NUCLEI
HIGH-TC SUPERCONDUCTORS
ISOTOPES
KNIGHT SHIFT
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LIGHT NUCLEI
MAGNETIC RESONANCE
MICROSTRUCTURE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXIDES
OXYGEN 17
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RESONANCE
STABLE ISOTOPES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES