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Magnetoresistance and Intrinsic Pinning of Vortices in the Untwinned YBa_2Cu_3O_{7 - δ} Single Crystals with Optimal Oxygen Content and a Small Deviation from the Oxygen Stoichiometry

100%
Vovk R., Gvozdikov V., Obolenskii M., Nazyrov Z., Kruglyak V.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1191-1194
EN
We study the temperature dependence of the in-plane magnetoresistance ρ_{ab}(T) in untwinned YBa_2Cu_3O_{7 - δ} single crystals with the optimal oxygen content and with a small deficit of oxygen atoms at different angles between the external magnetic field 15 kOe and the ab-planes α. We found that at high temperatures in the pseudogap region external magnetic field does not affect the ρ_{ab}(T) but it broadens transitional region T_{c} - T_{c0} from 0.3 K at zero field and α = 0 to approximately 6 K at α = 60° in the field. In case of optimal doping the function ρ_{ab}(T) display a 3D to 2D dimensional crossover when temperature decreases from T_{c} to T_{c0} and scaling near the T_{c0} which we relate to the flux-flow and vortex-lattice melting. In the underdoped sample the vortices are effectively pinned by the random oxygen vacancies and the function ρ_{ab}(T) in transitional region has smooth tails without any traces of crossover and scaling.
2
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Excess Conductivity of Y_{0.95}Pr_{0.05}Ba_2Cu_3O_{7-x} Single Crystals

100%
Vovk R., Obolenskii M., Bondarenko A., Goulatis I., Chroneos A.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
129-133
EN
In this work we investigate the conductivity in the basis plane of YBa_2Cu_3O_{7-x} and Y_{1-z}Pr_zBa_2Cu_3O_{7-x} single crystals with a system of one-direction twin boundaries. The Pr dopants behave as efficient scattering centers of normal and fluctuating carriers. For this a slight doping with praseodymium (till z≈0.05) results in a significant narrowing of the temperature interval in which the pseudo-gap regime is realized in the ab-plane of YBaCuO single crystals.
3
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Effect of Oxygen Redistribution on Temperature Dependence of Pseudo-Gap in Underdoped HoBa_{2}Cu_{3}O_{7-δ} Single Crystals

86%
Vovk R., Nazyrov Z., Obolenskii M., Pinto Simoes V., Januszczyk M., Latosińska J.
Acta Physica Polonica A
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2011
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vol. 120
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issue 3
512-515
EN
The effect of annealing at room temperature on the excess conductivity of oxygen deficient HoBa_2Cu_{3}O_{7 - δ} single crystal is studied. It is shown that there is substantial extension of the interval of linear dependence ρ_{ab} (T) and narrowing of the temperature area of the pseudo-gap regime as a result of annealing. The excess conductivity satisfies the exponential temperature dependence in a wide temperature interval. The temperature dependence of the pseudogap is satisfactorily described by the BCS-BEC theoretical model.
4
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Scattering Processes of Normal and Fluctuating Carriers in ReBa_2Cu_3O_{7-δ} (Re = Y, Ho) Single Crystals with Unidirectional Twin Boundaries

86%
Vovk R., Obolenskii M., Bondarenko A., Goulatis I., Levy M., Chroneos A.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
123-128
EN
The effect of twin boundaries on the normal and fluctuating conductivity of ReBaCuO (Re = Y, Ho) single crystals was investigated. The results indicate that the Lawrence-Doniach theoretical model describes adequately the temperature dependence of the excess conductivity. The twin boundaries are efficient scattering centers for normal and fluctuating carriers. The derived values of the coherence length perpendicular to the ab-planeξ_c(0) are in good agreement with those obtained from magnetic measurements for stoichiometric YBaCuO crystals.
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