2007/10/31 by F. Rullier-Albenque, H. Alloul, Fedor Balakirev +3
Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1209/0295-5075/81/37008
published as EPL 81, 37008 (2008) · version 2 with minor changes
openalex publication_date 2008/01/04 · arxiv created 2008/02/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
We have studied the influence of disorder induced by electron irradiation on the normal-state resistivities ρ( T ) of optimally and underdoped YBa 2 Cu 3 O x 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- T c 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.