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  • 1
    Electronic Resource
    Electronic Resource
    Electron spin resonance and magnetic susceptibility suggest superconductivity in Na doped WO samples (1999)
    Springer
    The European physical journal 12 (1999), S. 13-15 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.72.-h High-Tc compounds - 76.30.-v Electron paramagnetic resonance and relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In WO3 doped with Na (WO3:Na) an Electron Spin Resonance (ESR) signal with unresolved fine and/or hyperfine structure is detected and used as a probe for the state of the carriers. Using the saturation method we determined the spin-lattice relaxation rate 1/ T 1 of these paramagnetic centers. Upon cooling below 100 K, 1/ T 1 decreases markedly, as known to occur in NMR when a gap opens in the superconducting state. At low temperatures, 1/ T 1 quantitatively follows BCS behavior with a gap K or 2 . The magnetic susceptibility exhibits a strong difference between magnetic-field cooled and zero-field cooled regimes below which also supports a so far unknown superconducting phase resulting from Na doping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050969
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tilting Mode Relaxation and Oxygen Isotope Effect in La2−xSrxCuO4 Studied by Electron Paramagnetic Resonance (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 955-958 
    Details
    ISSN: 1572-9605
    Keywords: EPR ; LSCD ; isotope effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The electron paramegnetic resonance (EPR) of Mn2+ doped into La2−x Sr x CuO4 was used to probe the copper spin relaxation via the bottleneck effect for oxygen isotope (16O and 18O)–substituted samples. It was found that the EPR linewidth is larger for the 18O isotope samples than for the 16O samples. For x = 0.03, the linewidth for the 18O sample is larger than for 16O sample by a factor of 2. The isotope effect is pronounced at low temperatures and decreases with increasing Sr concentration. This effect is quantitatively explained by the Cu2+ S = 1/2 spin relaxation to the lattice via Dzyaloshinski terms coupled linearly to the local Q 4/Q 5 tilting modes of the CuO6 octahedra as proposed by Kochelaev et al. [1] The Q 4/Q 5 modes are coupled sterically to the Q 2 Jahn–Teller modes considered to be relevant for the (bi)-polaron formation and thus for the high-temperature superconductivity (HTSC).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026498123890
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  • 3
    Electronic Resource
    Electronic Resource
    Spin-lattice relaxation and Knight shift on protons in the hydrogen-doped superconducting system H0.2La1.8Sr0.2CuO4 (1996)
    Springer
    JETP letters 63 (1996), S. 560-565 
    Details
    ISSN: 1090-6487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the spin-lattice relaxation rate and Knight shift on protons in hydrogen-doped superconducting H0.2La1.8Sr0.2CuO4 samples are performed in the temperature range 4.2–300 K. An anomalous behavior of the spin-lattice relaxation rate is observed at low temperatures T∼20 K. A model is constructed that explains the appearance of carrier-depleted regions in the bulk of the semiconductor on the basis of the formation of a charged defect (proton).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567064
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  • 4
    Electronic Resource
    Electronic Resource
    Approximate formulas for calculating integral creep operators (1972)
    Springer
    Mechanics of composite materials 8 (1972), S. 985-987 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Approximate formulas for calculating integral operators such as the contraction type, containing regular and singular kernels of inheritance theory, are given. The approximations are evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00858343
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Solution of the integral equations of hereditary theory (1973)
    Springer
    Mechanics of composite materials 9 (1973), S. 64-67 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An approximate method is proposed for calculating the product of the Rabotnov ε operator and a continuous function of time. A collocation method is used to construct an approximate solution of the Volterra equation with a nondifference kernel in the form of the product of a fractional-exponential function and an arbitrary function of time. The error of the approximate solution is estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00856011
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  • 6
    Electronic Resource
    Electronic Resource
    Nucleus for unstable viscoelastic media (1972)
    Springer
    Mechanics of composite materials 8 (1972), S. 822-823 
    Details
    ISSN: 1573-8922
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A singular nondifferential creeping nucleus is suggested to describe the behavior of unstable viscoelastic materials, for which a resolvent is constructed, representing a nondifferential generalization of a fractional exponential function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00856123
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    Paper (German National Licenses)
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