Physics – Condensed Matter – Superconductivity
Scientific paper
2001-02-16
Physics
Condensed Matter
Superconductivity
latex rullier1.tex, 5 files, 4 pages [SPEC-S01/003], submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.87.157001
We report resistivity measurements in underdoped YBa$_{2}$Cu$_{3}$O$_{6.6} $and overdoped Tl$_{2}$Ba$_{2}$CuO$_{6+x}$ single crystals in which the concentration of defects in the CuO$_{2}$ planes is controlled by electron irradiation. Low $T$ upturns of the resistivity are observed in both cases for large defect content. In the Tl compound the decrease of conductivity scales as expected from weak localization theory. On the contrary in YBa$_{2}$Cu$_{3}$O$_{6.6}$ the much larger low T contribution to the resistivity is proportional to the defect content and might then be associated to a Kondo like spin flip scattering term. This would be consistent with the results on the magnetic properties induced by spinless defects.
Alloul Henri
Rullier-Albenque Florence
Tourbot R.
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