sup 63 Cu Knight shifts in the superconducting state of YBa sub 2 Cu sub 3 O sub 7 minus. delta. ( T sub c =90 K)

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.6283· OSTI ID:6837365

Barrett, S E; Durand, D J; Pennington, C H; Slichter, C P; Friedmann, T A; Rice, J P; Ginsberg, D M ^[1]

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1. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL (USA) Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (USA)

The authors have used {sup 89}Y NMR to measure the internal magnetic field of a sample of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} ({ital T}{sub {ital c}}=90 K) in the superconducting state to correct for the effects of the Meissner shielding currents. They used this information to separate the magnetic-shift tensor into orbital (chemical-shift) and spin (Knight-shift) contributions. They find that the temperature dependence of the chain Cu Knight shift fits the classic Yosida function of weak-coupling, orbital-{ital s}-state, spin-singlet BCS theory. For the planes, the Knight shift also requires a spin singlet, but with a strong-coupling Yosida function. The best fit is for an orbital {ital s} state, but an orbital {ital d} state is also possible. They find a zero-temperature gap {Delta}(0) of 1.76{ital k}{sub {ital B}T{ital c}} for the chains. For the planes, {Delta}(0) can range from 1.9{ital k}{sub {ital B}T{ital c}} to 3.1{ital k}{sub {ital B}T{ital c}}.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 6837365
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:10; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER 63
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
D STATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
ENERGY LEVELS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KNIGHT SHIFT
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC RESONANCE
MINERALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHYSICAL PROPERTIES
RADIOISOTOPES
RELAXATION
RESONANCE
S STATES
SECONDS LIVING RADIOISOTOPES
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
STOICHIOMETRY
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM 89
YTTRIUM COMPOUNDS
YTTRIUM ISOTOPES
YTTRIUM OXIDES