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NMR and NQR studies of copper oxide superconductors (invited)

Journal Article · · J. Appl. Phys.; (United States)
DOI:https://doi.org/10.1063/1.342515· OSTI ID:7015607
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/sup 63//sup ,//sup 65/Cu NMR and NQR measurements reveal remarkably different electronic character at the Cu(1) chain and Cu(2) plane sites in YBa/sub 2/Cu/sub 3/O/sub 7.0/. In the normal state, spin-lattice relaxation rates at both sites are strongly enhanced relative to estimated d-band Korringa (T/sub 1/) rates, but have sharply different temperature dependencies. Moreover, T/sub 1/ anisotropy is greater than an enhanced Korringa model can account for. Below T/sub c/, the temperature dependencies reveal significantly different spectra for quasiparticle excitation at the two sites with the strongest apparent energy gap occurring for the planar Cu(2) sites. At reduced oxygen content (YBa/sub 2/Cu/sub 3/O/sub 6.7/) the relaxation at the Cu(1) sites is only slightly (approx.30%) less than observed for YBa/sub 2/Cu/sub 3/O/sub 7.0/ while the rates for the resonance at the frequency of the Cu(2) sites in YBa/sub 2/Cu/sub 3/O/sub 7.0/ exhibit a large (approx.2000 x ) decrease for a minority of planar Cu(2) sites indicates that these sites are electronically inactive. NMR shift measurements are used to analyze the susceptibility of YBa/sub 2/Cu/sub 3/O/sub 7.0/ and obtain an upper limit for the electronic density of states.

Research Organization:
ATandT Bell Laboratories, Murray Hill, New Jersey 07974
OSTI ID:
7015607
Journal Information:
J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 64:10; ISSN JAPIA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COPPER 63
COPPER 65
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
MAGNETIC SUSCEPTIBILITY
NUCLEAR MAGNETIC RESONANCE
NUCLEAR QUADRUPOLE RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESONANCE
STABLE ISOTOPES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS