Перегляд за автором "Vovk, R.V."

Результати 1-20 з 34

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2D−3D crossover of the in-plane paraconductivity in optimal doped ReBa₂Cu₃O₇₋δ (Re = Y, Ho) single crystals

Vovk, R.V.; Obolenskii, M.A.; Bondarenko, A.V.; Goulatis, I.L.; Chroneos, A.I. (Физика и техника высоких давлений, 2007)

The effect of the fluctuation paraconductivity in optimal oxygen-doped ReBa₂Cu₃O₇₋δ (Re = Y, Ho) single crystals has been investigated. The results indicate that the theoretical model of Aslamazov–Larkin (AL) describes the ...
Aging-effect in optimal doped Yba₂Cu₃O₇₋δ single crystals

Nazyrov, Z.F.; Popova, A.V.; Vovk, R.V. (Functional Materials, 2014)

We investigate the conducting properties of the optimally oxygen doped YBa₂Cu₃O₇₋δ single crystals in the basal ab-plane before and after a long time exposure (aging) at air atmosphere. Prolonged exposure leads to increase ...
Anisotropy of magnetoresistance in untwinned YBa₂Cu₃O₇₋δ single crystals

Vovk, R.V.; Nazyrov, Z.F.; Kruglyak, V.V.; Ogrin, F.Y. (Functional Materials, 2012)

In this work we study an influence of the disorientation angle between direction of constant magnetic field up to 15 kOe and ah-plane α ≡ ∠(H,ab) on the temperature dependences of the excess conductivity in the temperature ...
Atomistic models for R1–xPrxBa2Cu3O7–δ (R = Y and lanthanides) and related oxides

Chroneos, A.I.; Goulatis, I.L.; Vovk, R.V.; Zavgorodniy, A.A.; Obolenskii, M.A.; Petrenko, A.G.; Samoilov, A.V. (2009)

We report the results of defect structures studies of silicon implanted at different temperatures with Mn ions (Si:Mn) and of GaMnAs layers, next annealed under ambient and high pressures. An influence of annealing conditions ...
Atomistic studies of Li+ migration in Y₂O₃ and the structure of related oxides

Chroneos, A.I.; Busker, G.; Goulatis, I.L.; Vovk, R.V.; Zavgorodniy, A.A.; Obolenskii, M.A.; Petrenko, A.G.; Pinto Simoes, V.M.; Samoilov, A.V. (Физика и техника высоких давлений, 2009)

Atomistic computer simulation techniques based on energy minimization have been employed to predict the equilibrium lattice parameters and volumes of a series of rare-earth sesquioxides and their polymorphs. The results ...
Condictivity anisotropy and pseudogap state evolution in HoBa₂Cu₃O₇₋δ single crystals of a present flat defect topology at decreasing oxygen concentration

Obolenskii, M.A.; Vovk, R.V.; Bondarenko, A.V.; Goulatis, I.L. (Functional Materials, 2006)

The temperature dependences of electrical resistance along the c-axis and in the abplane for HoBa₂Cu₃O₇₋δ single crystals with various oxygen content have been measured. The temperature dependences of the pseudogap value ...
Conductivity anisotropy in Y₁₋zPrzBa₂Cu₃O₇₋delta single crystals with different praseodymium content

Vovk, R.V.; Nazyrov, Z.F.; Obolenskii, M.A.; Zavgorodniy, A.A.; Pinto Simoes, V.M. (Functional Materials, 2011)
Conductivity of YBCO ceramics in a wide range of temperatures and hafnium impurities concentrations

Savich, S.V.; Samoilov, A.V.; Samsonik, A.L.; Sukhov, V.N.; Tiutierieva, K.V.; Rusalovich, A.I.; Vovk, R.V.; Boynik, A.B.; Chroneos, A. (Functional Materials, 2016)

Conductivity of Hf doped YBa₂Cu₃O₇-δ ceramics was studied in the work. It was shown that introduction of Hf additive leads to increase of amount of scattering effective centers of the normal carriers. Excessive conductivity ...
Creep and depinning of vortices in nontwinned YBa₂Cu₃O₆.₈₇ single crystal

Bondarenko, A.V.; Zavgorodniy, A.A.; Lotnik, D.A.; Obolenskii, M.A.; Vovk, R.V. (Физика низких температур, 2008)

We present the results of transport study of vortex dynamics in YBa₂Cu₃O₆.₈₇ crystals in the magnetic field H||c. In low magnetic fields, H<4 kOe, the measurements were performed in the range of vortex velocities v=10⁻⁴–2 ...
Creep of the Ti₃AlC₂ MAX-phase ceramics

Boyko, Yu.I.; Bogdanov, V.V.; Gevorkyan, E.S.; Vovk, R.V.; Korshak, V.F.; Kolesnichenko, V.A. (Functional Materials, 2019)

The process of plastic deformation of multicomponent ceramics based on the MAX phase at room temperature and at higher (1000 °C) temperature has been studied by dilatometry and microindentation. Based on the experimentally ...
Effect of electron irradiation on excess conductivity of single Y₁Ba₂Cu₃O₇₋δ crystals

Azarenkov, N.A.; Voevodin, V.N.; Vovk, R.V.; Vovk, S.R.; Khadzhai, G.Ya.; Sklyar, V.V. (Functional Materials, 2018)

Effect of electron irradiation on the excess conductivity of Y₁Ba₂Cu₃O₇₋δ single crystals is investigated. It is shown that irradiation with electrons leads to significant expansion of the temperature interval that excess ...
Effect of high pressure on conductivity in the basal plane of Y₁₋xPrxBa₂Cu₃O₇₋δ single crystals lightly doped of praseodymium

Khadzhai, G.Ya.; Vovk, N.R.; Vovk, R.V.; Savich, S.V.; Kislitsa, M.; Kotvitskaya, K.A.; Morozov, V.S.; Leniv, J.G.; Timofeev, S.S. (Functional Materials, 2014)

Effect of high hydrostatic pressure up to 17 kbar on conductivity of lightly Pr-doped Y₁₋xPrxBa₂Cu₃O₇₋δ (x~0.05) single crystals is investigated. We show that in contrast to non-doped YBa2Cu3O7-δ samples, application of ...
Effect of longitudinal magnetic field on the excess conductivity of monodomain YBa₂Cu₃O₇-δ single crystals

Tiutierieva, K.V.; Zavgorodnya, N.M.; Dovgopolova, Ya.V.; Chernovol-Tkachenko, O.O.; Vovk, R.V.; Chroneos, A. (Functional Materials, 2016)

In the present study influence of longitudinal magnetic field on temperature dependence of the excess conductivity in the temperature interval of transition to the superconducting state in untwinned YBa₂Cu₃O₇-δ single ...
Effect of oxygen deficit on temperature dependence of excess conductivity in Y₁Ba₂Cu₃O₇-δ single crystals

Bondarenko, A.V.; Vovk, R.V.; Obolensky, M.A.; Chebotaev, N.N. (Functional Materials, 2006)

Evolution of the excess conductivity in Y₁Ba₂Cu₃O₇-δ single crystals has been studied under stepwise oxygen removal by heat treatment. The concentration dependence of the coherence length along С axis εc(0) on the oxygen ...
Effect of praseodymium doping on electroresistivity along c-axis in Y₁₋xPrxBa₂Cu₃O₇₋δ single crystals

Vovk, R.V.; Vovk, N.R.; Samoilov, A.V. (Functional Materials, 2013)

In the present study influence of praseodymium doping on conductivity across (transverse) the basal plane of high-temperature superconducting Y₁₋xPrxBa₂Cu₃O₇₋δ single crystals is investigated. It is determined that ...
Effect of pressure on paraconductivity in HoBa₂Cu₃O₇-δ single crystals with oxygen deficiency

Tiutierieva, K.V.; Dovgopolova, Ya.V.; Chernovol-Tkachenko, O.O.; Ivrij, I.L.; Vovk, R.V.; Prihod'ko, S.I. (Functional Materials, 2016)

In this work, we have investigated the effect of high pressure on conductivity in basal plane of the high temperature super conducting single crystals HoBa₂Cu₃O₇-δ with oxygen deficiency. It has been determined that the ...
Effect of transverse and longitudinal magnetic field on the excess conductivity of YBa₂Cu₃₋zAlzO₇₋δ single crystals with a given topology of plane defects

Vovk, R.V.; Nazyrov, Z.F.; Khadzhai, G.Ya.; Pinto Simoes, V.M.; Kruglyak, V.V. (Functional Materials, 2013)

The effect of a constant magnetic field to 12.7 kOe on the temperature dependences of electric conductivity of aluminum-doped YBaCuO single crystals with a system of unidirectional twinning boundaries has been investigated. ...
Effect of twin boundaries on scattering processes of normal and fluctuating carriers in YBa₂Cu₃O₇₋δ single crystals

Obolensky, M.A.; Vovk, R.V.; Bondarenko, A.V. (Functional Materials, 2006)

Effect of twin boundaries on the normal and fluctuating conductivity of YBaCuO single crystals has been studied. The temperature dependence of the excess conductivity has been shown to be described satisfactorily by the ...
Evolution of normal electrical resistance in oxygen underdoped Ho₁Ba₂Cu₃O₇₋δ single crystals in the process of application-removal of high hydrostatic pressure

Vovk, R.V.; Khadzhai, G.Ya.; Nazyrov, Z.F. (Functional Materials, 2012)

The influence of high hydrostatic pressure on electrical resistance in afr-plane of oxygen underdoped Ho₁Ba₂Cu₃O₇₋δ has been studied. It was found that high-pressure-in-duced redistribution of labile oxygen leaded to ...
Evolution of over-conductivity of YВа₂Сu₃О₇-δ single crystals under the exposure of irradiation by high-energy electrons

Azarenkov, N.A.; Voyevodin, V.N.; Vovk, R.V.; Vovk, N.R.; Khadzhai, G.Ya.; Kamchatnaya, S.N. (Вопросы атомной науки и техники, 2020)

The evolution of the excess conductivity of YВа₂Сu₃О₇-δ single crystals upon electron irradiation is investigated. It was shown that electron irradiation leads to a significant expansion of the temperature range for the ...

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