sup 205 Tl NMR in Tl sub 2 Ba sub 2 CuO sub 6 and the t - J model
- Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands (NL)
- Philips Research Laboratories, P.O. Box 80000, 5600 JA Eindhoven, The Netherlands (NL)
The {sup 205}Tl nuclear-spin--lattice relaxation rate in Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} has been measured as a function of temperature and oxygen content {delta}. With a slight increase in oxygen content, {ital T}{sub {ital c}} decreases from 80 to 0 K; samples with lower {ital T}{sub {ital c}}'s have higher conductivities but slower Tl relaxation rates. The relaxation data closely resemble those for Cu(2) in YBa{sub 2}Cu{sub 3}O{sub 7}. Only 0.2% of Cu {ital d} spins in the Tl 6{ital s} orbital is needed to explain this result. In a simple model calculation we show that such an admixture is quite plausible. Essential is an asymmetric location of the Tl{sup 3+} ions in the crystal lattice. The Cu-spin-dominated relaxation process (which is not inconsistent with a two-band model) and the decrease in relaxation rate with increasing conductivity are in agreement with the {ital t}-{ital J} model.
- OSTI ID:
- 6837019
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:10; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL MODELS
HEAVY NUCLEI
ISOTOPES
MAGNETIC RESONANCE
MATHEMATICAL MODELS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RELAXATION
RESONANCE
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THALLIUM 205
THALLIUM COMPOUNDS
THALLIUM ISOTOPES
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE