Abstract
Tl205 NMR spectra and spin-lattice relaxation in the normal and superconducting states were measured on an aligned sample of Tl2Ba2Ca2Cu3O10+'. The spin-lattice relaxation time, T1, was found to be isotropic and, in the normal state, 1/T1T to be temperature dependent, indicating the presence of spin fluctuations in the thallium-oxygen plane similar to that found in the copper-oxygen plane of YBa2Cu3O7. $ sup 205"Tl NMR spectra at 5 K were studied and the angular dependence of the field shift at the saddle points of the magnetic-field distribution was found to be consistent with the anisotropic London theory. The average penetration depth was inferred to be 7040350. Our approach to determine the penetration depth, the saddle-point field analysis, is insensitive to distortion of the flux lattice associated with pinning. This is in contrast to the more commonly used second-moment method.
Original language | English (US) |
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Pages (from-to) | 4945-4951 |
Number of pages | 7 |
Journal | Physical Review B |
Volume | 45 |
Issue number | 9 |
DOIs | |
State | Published - 1992 |
ASJC Scopus subject areas
- Condensed Matter Physics