Abstract
The 63Cu spin-lattice relaxation rate has been measured in an annealed sample of Tl2Ba2Ca2Cu3O10 with Tc = 123 K, and compared with that in the previously reported asgrown sample with Tc = 115 K. We found, for the first time, that Tc increases as a result of a decrease in the residual density of states (DOS), Nres, at the Fermi level due to the improvement of crystal ordering by annealing. Based on the T1 result, Nres normalized by the value at Tc, Nres/N0, was found to be reduced from 0.30 to 0.18 after annealing. A 2-dimensional d-wave superconductivity model accounts for the increase of Tc in terms of the change in potential scattering due to crystal imperfection, which is probably caused by Ca/Tl inter-substitution.
Original language | English |
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Pages (from-to) | 1880-1883 |
Number of pages | 4 |
Journal | journal of the physical society of japan |
Volume | 66 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 1997 |
Externally published | Yes |
Keywords
- DOS
- Disorder
- High T
- NMR
- T
- d-wave
ASJC Scopus subject areas
- Physics and Astronomy(all)