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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of surface impedance of Tl2Ba2CaCu2O8−δ and YBa2Cu3O6.95 single crystals measured in the microwave band (1997)
    Springer
    Journal of experimental and theoretical physics 85 (1997), S. 1211-1217 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The real part R s and the imaginary part X s of the surface impedance Z s=R s+ iX s of Tl2Ba2CaCu2O8−δ and YBa2Cu3O6.95 single crystals have been measured with high precision at frequency ω/2π=9.4 GHz in the temperature range 0〈T〈140 K. In the Tl2Ba2CaCu2O8−δ crystal a linear temperature dependence R s(T) has been found for T⩽50 K, and the magnetic field penetration depth λ(4.2 K)=X s(4.2 K)/ω μ 0≈3760 Å has been measured. Along with well known features of the function Z s(T) in high-quality YBa2Cu3O6.95 single crystals, such as the linearity of λ(T) and R s(T) for T〈T c/3 and a maximum of R s(T) at T∼T c/2, the linearity range of λ(T) extends to T≃50 K, and this curve has a plateau in the range 60〈T〈85 K. The curve of R s(T) in both the superconducting and normal states of YBa2Cu3O6.95 is well described by a two-fluid model with the electron-phonon mechanism of quasiparticle relaxation. A formula describing the curve of λ 2(0)/λ 2(T) throughout the studied temperature range is also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558395
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  • 2
    Electronic Resource
    Electronic Resource
    Microwave response of high-T c superconducting crystals: Results, problems, and prospects (2000)
    Springer
    JETP letters 72 (2000), S. 583-592 
    Details
    ISSN: 1090-6487
    Keywords: 74.25.Nf ; 74.72.−h ; 74.20.De
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of studying temperature behavior of the microwave surface impedance Z s (T) and conductivity tensor $$\hat \sigma (T)$$ (T) of high-T c superconducting (HTSC) single crystals are analyzed. The emphasis is on the experimental facts that are inconsistent with the known electrodynamic concepts of conductivity mechanisms in these materials. Possible reasons for the inconsistency are discussed in the context of structural features of the HTSC crystals, and the outlook for future investigations is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1348486
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  • 3
    Electronic Resource
    Electronic Resource
    Characteristic features of the temperature dependence of the surface impedance of YBa2Cu3O6.95 single crystals (1997)
    Springer
    JETP letters 65 (1997), S. 938-944 
    Details
    ISSN: 1090-6487
    Keywords: 74.25.Nf ; 74.72.Bk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The real and imaginary parts of the surface impedance Z s =R s +iX s of YBa2Cu3O6.95 single crystals are measured at a frequency ω/π=9.4 GHz. The quantities R s (T) and X s (T) are linear functions of temperature for T〈0.3T c (T c =93.5 K). A maximum of R s (T) and a plateau of X s (T) are observed in the interval 35〈T〈65 K. Our experimental data, just as all recent measurements of R s (T) in YBa2Cu3O6.95 single crystals in the temperature range 0〈T〈1.3T c , are described well in a two-fluid model which assumes electron-phonon scattering of quasiparticles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567453
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  • 4
    Electronic Resource
    Electronic Resource
    Microwave impedance of Ba0.6K0.4BiO3 crystals: Comparison with Nb (1997)
    Springer
    Journal of experimental and theoretical physics 84 (1997), S. 383-387 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The surface impedance Z s=R s+iX s of samples of Ba0.6K0.4BiO3 in the temperature range 4〈T〈50 K is measured at 9.42 GHz. The BCS theory completely describes the electrodynamic properties of Nb in the dirty limit, and its application to Ba0.6K0.4BiO3 allows determination of the London penetration depth λ L(0)=3100±100 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558127
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  • 5
    Electronic Resource
    Electronic Resource
    Linear low-temperature dependence of the surface impedance of a Ba0.6K0.4BiO3 single crystal (1996)
    Springer
    JETP letters 64 (1996), S. 832-838 
    Details
    ISSN: 1090-6487
    Keywords: 84.37.+q ; 74.72.Yg ; 74.72.Bk ; 74.72.Hs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependences of the real part R s and the imaginary part X s of the surface impedance Z s =R s +iX s of the superconductor Ba0.6K0.4BiO3 (T c ≃30 K) are measured at a frequency of 9.4 GHz. Its temperature dependence Z s (T) and that of the complex conductivity σ s (T) can be described on the basis of a two-fluid model under two assumptions: The density of superconducting carriers increases linearly, and the relaxation time increases as a power law (∝1/T 5), with decreasing temperature T〈T c . This model also describes well the curves Z s (T) and σs (T) recently measured for YBa2Cu3O6.95 and Bi2Sr2CaCu2O8 single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567255
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  • 6
    Electronic Resource
    Electronic Resource
    c-axis penetration depth in Bi2Sr2CaCu2O8+δ single crystals measured by ac-susceptibility and cavity perturbation technique (2000)
    Springer
    JETP letters 71 (2000), S. 92-96 
    Details
    ISSN: 1090-6487
    Keywords: 74.72.Hs ; 74.25.Ha
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The c-axis penetration depth Δλc in Bi2Sr2CaCu2O8+δ (BSCCO) single crystals as a function of temperature has been determined using two techniques, namely, measurements of the ac-susceptibility at a frequency of 100 kHz and the surface impedance at 9.4 GHz. Both techniques yield an almost linear function Δλc(T)∝T in the temperature range T〈0.5T c. Electrodynamic analysis of the impedance anisotropy has allowed us to estimate λc(0)≈50 µm in BSCCO crystals overdoped with oxygen (T c≈84 K) and λc(0)≈150 µm at the optimal doping level (T c≈90 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568288
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  • 7
    Electronic Resource
    Electronic Resource
    Phenomenological description of the microwave surface impedance and complex conductivity of high-T c single crystals (2000)
    Springer
    Journal of experimental and theoretical physics 91 (2000), S. 801-816 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the microwave surface impedance Z s (T) = R s (T) + iX s (T) and the complex conductivity σs(T) in the ab-plane of high-quality high-T c YBCO, BSCCO, TBCCO, and TBCO single crystals are analyzed. Experimental data of Z s (T) and σs(T) are compared with calculations based on a modified two-fluid model that includes a temperature-dependent quasiparticle scattering and a unique temperature variation of the density of superconducting carriers. We describe the agreement and disagreement of our analysis with the salient features of the experimental data. We review the existing microscopic models based on unconventional symmetry types of the order parameter and on novel quasiparticle relaxation mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1326973
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  • 8
    Electronic Resource
    Electronic Resource
    Microwave magnetic-field effects in YBa2Cu3O7 single crystals nearT c (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1889-1894 
    Details
    ISSN: 0392-6737
    Keywords: Phenomenological and two-fluid theories ; Response to electromagnetic fields ; nuclear magnetic resonance ; ultrasonic attenuation ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The non-linear response nearT c and the complex electromagnetic conductivity of YBa2Cu3O7 single crystals at microwave frequencies are explained in the framework of the two-fluid model with the additional hypothesis that the e.m. field modulates the partial concentrations of both normal and superconducting fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462190
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature Dependence of Microwave Surface Impedance in High-T c Single Crystals: Experimental and Theoretical Aspects (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 381-408 
    Details
    ISSN: 1572-9605
    Keywords: Microwave response ; surface impedance ; complex conductivity ; high-T c single crystals ; phenomenological models ; microscopic theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A systematic description of recent measurements of the real R s and imaginary X s parts of the microwave surface impedance R s+ iX s in high-quality high-T c, superconducting single crystals, namely YBa2Cu3O6.95, Ba0.6K0.4BiO3, TI2Ba2CaCu2O8−δ, Tl2Ba2CuO6+δ, and Bi2Sr2CaCu2O8, is given. Electrodynamic principles of experimental techniques and uncontrollable factors that affect the accuracy of R s(T) and X s(T) measurements are analyzed. Common and distinctive features in the temperature dependences of the surface impedance and complex conductivity in various high-T c crystals are discussed. The experimental data are interpreted in terms of the two-fluid model taking into account scattering of quasiparticles and characteristic changes in the density of superconducting carriers as a function of temperature. The existing microscopic models of the microwave response of high-T c superconductors are considered and prospects for further research are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022608613185
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