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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

2007

vol. 111

issue 1

129-133

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.

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

2007

vol. 111

issue 1

123-128

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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2 Acta Physica Polonica A

2 2007

2 Bondarenko A.

2 Chroneos A.

2 Goulatis I.

2 Obolenskii M.

2 Vovk R.

1 Levy M.

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Excess Conductivity of Y_{0.95}Pr_{0.05}Ba_2Cu_3O_{7-x} Single Crystals

Scattering Processes of Normal and Fluctuating Carriers in ReBa_2Cu_3O_{7-δ} (Re = Y, Ho) Single Crystals with Unidirectional Twin Boundaries