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  • 1
    Electronic Resource
    Electronic Resource
    Acoustic physics Suspended by sound (2001)
    [s.l.] : Nature Publishing Group
    Nature 413 (2001), S. 474-475 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is well known that radiation can exert a force. The solar wind, for example, is caused by sunlight blowing away microscopic dust particles, and its force on a sunbather is equal to the weight of a fly. It is probably less well known that sound waves also exert a force. The radiation force on a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35097192
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrating reed magnetometry: An application for ceramic superconductors (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4936-4942 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A vibrating reed of a high-Tc superconductor with electrostatic excitation and sensoring may be used as a sensitive magnetometer. Its sensitivity can be increased (in our preliminary experiment, by a factor of 2.5) by placing the free tip of the reed between two flat superconductors, which may also serve as capacitance electrodes. This arrangement can be used to obtain the irreversible magnetization curve of the electrode material from the resonance frequency of the reed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343210
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of the vibrating ferromagnetic reed (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 3224-3230 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The complete theory of the magnetomechanical pole effect is given. This effect refers to the change of the resonance frequency of a ferromagnetic reed or bar vibrating in an axial magnetic field, in the absence of intrinsic effects such as the ΔE effect. From the general formulation (arbitrarily shaped reed, reed and field may be inhomogeneous) we derive explicit expressions for the frequency spectrum and vibration modes within the single-pole approximation. This applies to reeds with constant magnetization. The first-order corrections due to nonconstant magnetization are given. The second-order corrections are shown to vanish. The field dependence of the attenuation is derived. With appropriate choice of the field inhomogeneity the pole effect can be strongly enhanced, inverted, or exactly compensated to zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336903
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  • 4
    Electronic Resource
    Electronic Resource
    Friction in levitated superconductors (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1554-1556 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A type I superconductor levitated above a magnet of low symmetry has a unique equilibrium position about which it may oscillate freely. In contrast, a type II superconductor has a continuous range of stable equilibrium positions and orientations where it floats rigidly without swinging or orbiting as if it were stuck in sand. A strong internal friction conspicuously indicates the existence and unpinning of flux lines in oxide superconductors levitated above liquid nitrogen. It is shown how these effects follow from the hysteretic magnetization curves and how the energy is dissipated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100435
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  • 5
    Electronic Resource
    Electronic Resource
    Local magnetic anisotropy in amorphous transition metals: A problem of metal physics treated with methods of quantum chemistry
    Amsterdam : Elsevier
    Chemical Physics 130 (1989), S. 65-87 
    Details
    ISSN: 0301-0104
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0301-0104(89)87037-5
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  • 6
    Electronic Resource
    Electronic Resource
    Flux diffusion in high-T c superconductors (1990)
    Springer
    The European physical journal 80 (1990), S. 167-175 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In type-II superconductors in the flux flow (J ⊥≫J c ), flux creep (J c ⊥≈J c ), and thermally activated flux flow (TAFF) (J ⊥≪J c ) regimes the inductionB(r,t), averaged over several penetration depths λ, in general follows from a nonlinear equation of motion into which enter the nonlinear resistivities ρ⊥(B, J ⊥,T) caused by flux motion and ρ‖(B, J ‖,T) caused by other dissipative processes.J ⊥ andJ ‖ are the current densities perpendicular and parallel toB,B=|B|, andT is the temperature. For flux flow and TAFF in isotropic superconductors with weak relative spatial variation ofB, this equation reduces to the diffusion equation $$\dot B = (\rho _ \bot /\mu _0 ) \bar V^2 B$$ plus a correction term which vanishes whenJ ‖=0 (this means B×
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01357498
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of the gap distribution in YBa2Cu3O7 using a far-infrared reflection-Fabry-Pérot device (1993)
    Springer
    The European physical journal 90 (1993), S. 3-12 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports on far-infrared measurements of YBa2Cu3O7 films oriented with the c-axis perpendicular to the surface, by using a silicon reflection Fabry-Pérot interferometer as a multireflection device. From these we could derive the dielectric function, the refractive index, the field penetration depth and the surface impedance of the material. The one order of magnitude higher sensitivity of the method compared to a direct reflectance measurement allowed to find an almost continuous gap distribution in the 70–215 cm−1 region together with a separate gap at about 330 cm−1. A quasizero gap absorption is found down to 20 cm−1 even at low temperatures (10 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01321026
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic field density of perfect and imperfect flux line lattices in type II superconductors. I. Application of periodic solutions (1988)
    Springer
    Journal of low temperature physics 73 (1988), S. 355-390 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The densityn(B) of the spatially varying magnetic fieldB inside a type II superconductor can be measured by nuclear magnetic resonance or muon-spin rotation (μ+SR). For a perfect flux-line latticen(B) exhibits van Hove singularities at the maximum, minimum, and saddle point values of the ideally periodicB(r). In a real superconductor, these singularities are smeared due to distortions of the flux-line lattice caused by, e.g., the interaction of flux lines with inhomogeneities in the material (pinning), structural defects in the flux-line lattice, the nonellipsoidal shape of the specimen, or fluctuations of the applied field and temperature. Such perturbations of the periodicity ofB(r) typically broaden the idealn(B) by convolution with a Gaussian whose width in general depends onB and which thus smears each singularity differently. Knowledge of the broadening is required for the interpretation of μ+SR experiments in the new ceramic superconductors and also in pure niobium, where it competes with the broadening caused by the diffusion of the positive muons. In this paper (Part I), the broadening ofn(B) is discussed in detail and some of its features are derived from the periodic solutions of the Ginzburg-Landau and BCS-Gorkov theories. Forthcoming parts will deal with the application of nonperiodic solutions and with computer simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683568
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  • 9
    Electronic Resource
    Electronic Resource
    Longitudinal critical current in type II superconductors. I. Helical vortex instability in the bulk (1981)
    Springer
    Journal of low temperature physics 44 (1981), S. 33-57 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: The vortex lattice in type II superconductors is unstable against the growth of helical perturbations if the current along the vortices exceeds a critical value. The longitudinal critical current, the pitch, and the spatially varying amplitude of the elliptically polarized helices are calculated from the London theory at the onset of instability in planar current distributions far from the surface. For weak pinning (αLλ2 ≪ c 66) the wavelength and width of the mode extend over the entire specimen, and the critical current is 2H(c 66/c 11)1/4. For moderate pinning (c 66 αLλ2 ≪ c 11) the wavelength and width are close to Campbell's pinning length (c 11/αL)1/2, and the critical current times its mean density is 2H 2(αL/c 11)1/2. For strong pinning (αLλ2 ≪ c 11) helical instability occurs at pin-free vortex sections, the helix wavelength is 2.2d, and the critical current density is 0.47Hd/λ2 (H, d, c 11 and c 66), and αL are the magnetic field, spacing, elastic moduli, and pinning parameter of the vortex lattice, and λ is the magnetic penetration depth).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115074
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  • 10
    Electronic Resource
    Electronic Resource
    Flux-line cutting in type II superconductors (1979)
    Springer
    Journal of low temperature physics 37 (1979), S. 43-55 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Experimental evidence for flux-line cutting in superconductors (intersection and cross-joining of singly quantized vortices) is briefly reviewed. The interaction energy between two straight vortices tilted at an angle α (≠ 0)is then shown to be finite in the London model, i.e., in the limit of vanishing core radius. Next, the activation energy and maximum interaction force are calculated for the vortices in an analytic approximation to the Ginzburg-Landau theory. Here two competing interactions determine the behavior. Electromagnetic repulsion (0 〈 α 〈 π/2) varies as cos α and decays over distances scaled by the penetration depth λ, while core attraction is independent of α and varies over distances scaled by the coherence length ξ. The force is always repulsive at large flux-line separation (0 〈 α 〈 π/2) and its maximum decreases rapidly as κ decreases, so that flux-line cutting isexpected to be more probable in low-κ materials. The calculations provide a basis for explaining longitudinal flux-flow resistance as well as some intriguing magnetization behavior in the same configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114055
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