TY  - JOUR
A1  - Vovk, Ruslan V.
A1  - Vovk, Nikolaj R.
A1  - Dobrovolskiy, Oleksandr V.
T1  - Aging effect on electrical conductivity of pure and al-doped YBa2Cu3O7−δ single crystals with a given topology of planar defects
T2  - Advances in condensed matter physics
N2  - The conducting properties in the basal ab plane of pure and Al-doped YBa2Cu3O7-γ single crystals before and after long-time exposure in air atmosphere are investigated. It is shown that prolonged aging leads to an increase of the density of effective scattering centers for the normal carriers. The aluminum doping has been revealed to partially slowdown the degradation of the conducting properties in process of aging. The excess conductivity, Δδ(T), has been found to obey exponential dependence in the broad temperature range Tc<T<T*. In the pseudogap regime, the mean-field transition temperature  and the 3D-2D crossover point in the excess conductivity have been quantified. Near the critical temperature,  is described well within the Aslamazov-Larkin theoretical model. Herewith, both aluminum doping and prolonged aging have been found to essentially expand the temperature interval of implementation of the pseudogap state, thus narrowing the linear section in the dependence ρab(T).
Y1  - 2013
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/50506
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-505066
SN  - 1687-8124
SN  - 1687-8108
N1  - Copyright © 2013 Ruslan V. Vovk et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
VL  - 2013
IS  - Art. 931726
SP  - 1
EP  - 7
PB  - Hindawi Publ. Corp.
CY  - New York, NY [u. a.]
ER  -