Temperature-dependent anisotropy of Cu(2) nuclear-relaxation rate in YBa sub 2 Cu sub 3 O sub 7 below T sub c

Journal Article · Tue Oct 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.7764· OSTI ID:5172247

Takigawa, M ^[1]; Smith, J L; Hults, W L ^[2]

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1. IBM Thomas J. Watson Research Center, P. O. Box 218, Yorktown Heights, New York (USA)
2. Los Alamos National Laboratory, Los Alamos, New Mexico (USA)

We have measured the anisotropy of the Cu(2) nuclear-spin--lattice relaxation rate in the superconducting state of YBa{sub 2}Cu{sub 3}O{sub 7} in a small magnetic field (0.44 T) and the temperature range 30--210 K. The anisotropy is almost temperature independent in the normal state but develops a nonmonotonic temperature dependence below {ital T}{sub {ital c}} with a minimum near 70--80 K. The isotopic ratio of the relaxation rates shows that the nuclear relaxation is due to magnetic processes in this temperature range, although an extrinsic quadrupolar relaxation process appears below 30 K.

• OSTI ID: 5172247
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:14; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
LOW TEMPERATURE
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES