F. Rullier-Albenque et al 2008 EPL 81 37008 doi:10.1209/0295-5075/81/37008
F. Rullier-Albenque1, H. Alloul2, F. Balakirev3 and C. Proust4
Show affiliationsWe have studied the influence of disorder induced by electron irradiation on the normal-state resistivities ρ(T) of optimally and underdoped YBa2Cu3Ox single crystals, using pulsed magnetic fields up to 60 T to completely restore the normal state. We evidence that point defect disorder induces low-T upturns of ρ(T) which saturate in some cases at low T in large applied fields as would be expected for a Kondo-like magnetic response. Moreover, the magnitude of the upturns is related to the residual resistivity, that is to the concentration of defects and/or their nanoscale morphology. These upturns are found quantitatively identical to those reported in lower-Tc cuprates, which establishes the importance of disorder in these supposedly pure compounds. We therefore propose a realistic phase diagram of the cuprates, including disorder, in which the superconducting state might reach the antiferromagnetic phase in the clean limit.
74.62.Dh Effects of crystal defects, doping and substitution
74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
Issue 3 (February 2008)
Received 19 October 2007, accepted for publication 4 December 2007
Published 4 January 2008
F. Rullier-Albenque et al 2008 EPL 81 37008
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