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1

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.

2

Vacancy-Fluorine Clusters in Silicon

86%

Chroneos A., Vovk R., Goulatis I., Nazyrov Z., Pinto Simoes V., Januszczyk M., Latosińska J.

Acta Physica Polonica A

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2011

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vol. 119

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issue 6

774-777

EN

Fluorine (F) doping and the formation of F-vacancy (F_{n}V_{m}) clusters have been extensively studied in silicon (Si) as they can suppress the transient self-interstitial mediated diffusion of boron (B). Recent experimental studies by Bernardi et al. revealed that there is no significant concentration of F_{n}V_{m} clusters (for n ≥ 4, m ≥ 1) in disagreement with a number of density functional theory studies. In the present study we use electronic structure calculations to evaluate the binding energies of F_{n}V_{m} clusters and V_{n} clusters. The significant binding energies of the V _{n} clusters reveals that the concentration of the large F_{n}V_{m} clusters (n ≥4, m ≥1) will be limited compared to the V_{n} clusters or even smaller clusters.

3

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

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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3 Acta Physica Polonica A

1 2011

2 2007

3 Chroneos A.

3 Goulatis I.

3 Vovk R.

2 Bondarenko A.

2 Obolenskii M.

1 Januszczyk M.

1 Latosińska J.

1 Levy M.

1 Nazyrov Z.

1 Pinto Simoes V.

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

Vacancy-Fluorine Clusters in Silicon

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