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Author Reven, L. ♦ Shore, J. ♦ Yang, S. ♦ Duncan, T. ♦ Schwartz, D. ♦ Chung, J. ♦ Oldfield, E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ BARIUM OXIDES ♦ NUCLEAR MAGNETIC RESONANCE ♦ BISMUTH OXIDES ♦ CALCIUM OXIDES ♦ COPPER OXIDES ♦ LANTHANUM OXIDES ♦ STRONTIUM OXIDES ♦ THALLIUM OXIDES ♦ YTTRIUM OXIDES ♦ BCS THEORY ♦ HIGH-TC SUPERCONDUCTORS ♦ KNIGHT SHIFT ♦ LOW TEMPERATURE ♦ OXYGEN 17 ♦ SPIN-LATTICE RELAXATION ♦ TEMPERATURE DEPENDENCE ♦ ALKALINE EARTH METAL COMPOUNDS ♦ BARIUM COMPOUNDS ♦ BISMUTH COMPOUNDS ♦ CALCIUM COMPOUNDS ♦ CHALCOGENIDES ♦ COPPER COMPOUNDS ♦ EVEN-ODD NUCLEI ♦ ISOTOPES ♦ LANTHANUM COMPOUNDS ♦ LIGHT NUCLEI ♦ MAGNETIC RESONANCE ♦ NUCLEI ♦ OXIDES ♦ OXYGEN COMPOUNDS ♦ OXYGEN ISOTOPES ♦ RARE EARTH COMPOUNDS ♦ RELAXATION ♦ RESONANCE ♦ STABLE ISOTOPES ♦ STRONTIUM COMPOUNDS ♦ SUPERCONDUCTORS ♦ THALLIUM COMPOUNDS ♦ TRANSITION ELEMENT COMPOUNDS ♦ YTTRIUM COMPOUNDS ♦ Ceramics, Cermets, & Refractories- Physical Properties ♦ Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
Abstract We have measured the {sup 17}O nuclear-magnetic-resonance spin-lattice relaxation times ({ital T}{sub 1}) as a function of temperature for the CuO{sub 2} planar sites in Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8+{ital x}}, YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{ital x}}, La{sub 1.85}Sr{sub 0.15}CuO{sub 4{minus}{ital x}}, La{sub 1.85}Ca{sub 0.15}CuO{sub 4{minus}{ital x}}, and Bi{sub 2}Sr{sub 2}CuO{sub 6+{ital x}}, as well as for the oxygen sites in Ba{sub 0.6}K{sub 0.4}BiO{sub 3}, BaBi{sub 0.25}Pb{sub 0.75}O{sub 3}, BaSb{sub 0.25}Pb{sub 0.75}O{sub 3}, and BaPbO{sub 3}. The CuO{sub 2} planar sites in Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8+{ital x}}, YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}}, and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{ital x}} exhibit close to ideal Korringa behavior in the normal state, characteristic of a good metal. In addition, the Knight shift of the CuO{sub 2} planes in these three materials is dominated by a spin contribution that is temperature independent in the normal state and vanishes in the superconducting state. The relaxation times of the BaO and SrO planar oxygens, as well as of the TlO planar oxygens, are much longer than those of the CuO{sub 2} planes, and are similar to the values found for the bismuthate and plumbate materials. In both lanthanum cuprates, the frequency shift of the CuO{sub 2} plane is temperature dependent in the normal state. Relaxation-rate data, when plotted as a function of ln({ital T}{sub {ital c}}), show a clear difference between the bismuthate (plumbate) and cuprate materials, and appear consistent with BCS-like behavior for the copper-free systems.
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1991-05-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 43
Issue Number 13


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