NQR and NMR studies of YBa/sub 2/Cu/sub 3/O/sub x/ (6. 0 /le/ x /le/ 6. 91)
Nuclear Quadrupole Resonance (NQR) and Nuclear Magnetic Resonance (NMR) have been utilized to investigate the 90 K class superconductor YBa/sub 2/Cu/sub 3/O/sub 6.91/ and relevant oxides YBa/sub 2/Cu/sub 3/O/sub chi/(6.0/le/chi/le/6.91). Two/sup 63/Cu NQR lines have been observed at about 31 MHz and 22 MHz for chi = 6.91, which were proved to be from the Cu2 and Cu1 sites respectively using the NMR technique for an oriented sample. The spin-lattice relaxation time T/sub 1/ exhibits anomalous temperature dependence with high relaxation rate in the normal state. Power-law like temperature dependence was observed well below T/sub c/ for the Cu2 sites. The former indicates the strong influence of Cu spin fluctuations, while the latter may be understood as the realization of the anisotropic superconductivity. Antiferromagnetic nuclear resonance has been obtained for chi = 6.0 yielding a clear evidence of magnetic ordering in the Cu2-O/sub 2/ planes. This is consistent with neutron scattering and /mu/ SR studies.
- Research Organization:
- Tokyo Univ. (Japan). Inst. for Solid State Physics; Kyoto Univ. (Japan). Faculty of Science
- OSTI ID:
- 5690178
- Journal Information:
- Int. J. Mod. Phys. B; (United States), Journal Name: Int. J. Mod. Phys. B; (United States) Vol. 3:1; ISSN IJPBE
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANGULAR MOMENTUM
ANISOTROPY
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FLUCTUATIONS
MAGNETIC RESONANCE
MAGNETISM
NEUTRON DIFFRACTION
NUCLEAR MAGNETIC RESONANCE
NUCLEAR QUADRUPOLE RESONANCE
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RELAXATION
RESONANCE
SCATTERING
SPIN
SPIN-LATTICE RELAXATION
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES