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RISS 인기검색어
- 검색키워드
- 저자 : Khadzhai G.Ya. (검색결과 3 건)
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High-pressure effects on basal-plane conductivity of YPrBCO single crystals
Khadzhai G.Ya.,Kamchatnaya S.N.,Korobkov M.V.,Necheporenko Ya.V.,Vovk R.V.,Dobrovolskiy O.V. 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Influence of high hydrostatic pressure up to 12 kbar on the basal-plane electrical resistance of Y1-xPrxBa2Cu3O7-δ single crystals is investigated for moderate Pr doping levels (x ≈ 0.23). The application of high pressure leads to a threefold increase of the derivative dTc/dP in comparison with optimally-doped YBCO single crystals. Possible mechanisms of Tc suppression are discussed with account for features in the electronic spectrum of charge carriers, typical for lattices with strong coupling. The excess conductivity Δσ(T) obeys an exponential temperature dependence in the broad temperature range Tf < T < T*. The dependence Δσ(T) ∼ (1 - T /T∗)exp(Δ∗ab /T) is interpreted in terms of the mean-field theory, where T* is the mean-field temperature of transition to the pseudogap state and the temperature dependence of the pseudogap is described satisfactory within the BCS-BEC crossover theory. All in all, an increase of the pressure results in a narrowing of the pseudogap temperature interval, expanding the temperature range of resistance linear dependence.
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Transverse resistance of YBa2Cu3O7-δ single crystals
R.V. Vovk,G.Ya Khadzhai,O.V. Dobrovolskiy,Z.F. Nazyrov,A. Chroneos 한국물리학회 2015 Current Applied Physics Vol.15 No.5
Measured is the transverse electrical resistance of YBa2Cu3O7-δ single crystals with different oxygen deficiency values (δ) in the temperature range Tc - 300 K. The experimental data are approximated by an empiric expression accounting for the fluctuation conductivity near Tc and the semiconductor-like resistance regime. Our analysis of the concentration dependences of the fitting parameters, in particular, reveals that the resistance temperature dependence is largely affected by the sample's nonhomogeneity. The latter, in turn, causes a Tc anisotropy and variable-range hopping conductivity between different phases. The deduced maximal values of the basal-plane coherence length, ξxy(0), are comparable with those for low-temperature superconductors.
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Effect of high pressure on the fluctuation paraconductivity in Y0.95Pr0.05Ba2Cu3O7-d single crystals
R.V. Vovk,N.R. Vovk,G.Ya Khadzhai,O.V. Dobrovolskiy,Z.F. Nazyrov 한국물리학회 2014 Current Applied Physics Vol.14 No.12
The effect of high hydrostatic pressure up to 17 kbar on the fluctuation conductivity of lightly Pr-doped Y1xPrxBa2Cu3O7d (x z 0.05) single crystals is investigated. We show that in contrast to non-doped YBa2Cu3O7d samples, application of a high pressure leads to a substantial increase of the pressure derivative of the coherence length dxc/dP and a temperature shift of the 2D-3D crossover point. Possible mechanisms of the influence of high pressure on the critical temperature and the coherence length are discussed within the framework of a model assuming the presence of singularities in the charge carriers electron spectrum typical for lattices with strong coupling.
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