sup 17 O nuclear-magnetic-resonance spin-lattice relaxation and Knight-shift behavior in bismuthate, plumbate, and cuprate superconductors

Journal Article · Wed May 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.10466· OSTI ID:5810701

Reven, L; Shore, J; Yang, S; Duncan, T; Schwartz, D; Chung, J; Oldfield, E ^[1]

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1. School of Chemical Sciences, University of Illinois at Urbana-Champaign, 505 South Mathews Avenue, Urbana, Illinois 61801 (US) Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin

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.

• OSTI ID: 5810701
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:13; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
EVEN-ODD NUCLEI
HIGH-TC SUPERCONDUCTORS
ISOTOPES
KNIGHT SHIFT
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LIGHT NUCLEI
LOW TEMPERATURE
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OXIDES
OXYGEN 17
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
RARE EARTH COMPOUNDS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES