Volume 81, Number 3, February 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 January 2008|
Disorder, metal-insulator crossover and phase diagram in high-Tc cuprates
Service de Physique de l'Etat Condensé (CNRS URA 2464), CEA Saclay - 91191 Gif-sur-Yvette cedex, France
2 Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud - 91405 Orsay, France
3 National High Magnetic Field Laboratory, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
4 Laboratoire National des Champs Magnétiques Pulsés, UMR CNRS-UPS-INSA 5147 - Toulouse, France
Corresponding author: email@example.com
Accepted: 4 December 2007
We have studied the influence of disorder induced by electron irradiation on the normal-state resistivities 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 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.
PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.62.Dh – Effects of crystal defects, doping and substitution / 74.72.Bk – Y-based cuprates
© EPLA, 2008
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