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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 1 (1969), S. 45-58 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We reexamine here microscopically the transport properties of the vortex state in a dirty type II superconductor in the high-field region. We show that the previous theory by Caroli and Maki predicts the entropy carried by a single vortex line, which is consistent with recent experiments, provided the expression of the heat current is properly corrected. Furthermore, we show that a large heat delivered by vortex lines together with the normal thermoelectric effect, which persists even in the vortex state, results in a large Hall current in the vortex state. This may account for a large Hall effect observed by Niessenet al. in Nb-Ta alloys.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 1 (1969), S. 129-135 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider a cubic lattice of small magnetic spheres imbedded in a type II superconductor. We compute the field distribution for one sphere and the interaction energy when the moments are aligned. It is pointed out that the dipolar field due to the nearest neighbors, in opposition to the normal situation, is nonzero in the superconducting state and induces then an antiferromagnetic ordering of the moments.
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  • 3
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A determination of the surface scattering, mean free path, and bulk resistivity of electrons in a specimen requires three independent experiments. A new method is proposed making use of the measurement of the first and second terms in the expansion of a decaying eddy current in a thin plate. The decay rates have been calculated and tabulated using the free electron model and assuming an isotropic electron mean free path.
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  • 4
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Methods are developed for the numerical calculation of pinning forces resp. critical current densitiesJ cfrom experimental magnetization curves of cylinders. Application to Pb-Tl and Pb-In samples indicates a general lawJ c=I O(1 − H/Hc2)µ for well-annealed samples and largeH nearH c2, where the constant μ depends on the composition and possibly the temperature. The application of the method to neutron-irradiated Nb samples shows that the peak effect is much more pronounced in theJ c(H) curve than in the magnetization curve.
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  • 5
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interfacial tension of3He−4He mixtures at saturated vapor pressure has been measured precisely down to 0.15 K by means of the resonance of the interfacial wave. We found that the decrease of the interfacial tension from the value at absolute zero can be described as 56.8T 2 mdyne/cm up to about 0.4 K and that the extrapolated value at absolute zero is 23.9±1.0 mdyne/cm. The large temperature dependence in the low temperature region may be explained by the effect of the change in density difference between the two phases.
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  • 6
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on the first comprehensive measurements of critical superflow velocities in3He-B which allow different mechanisms of vortex formation to be identified. As a function of temperatureT and pressureP, we measure the critical angular velocity Ωc(T, P) at which vortices start to form in slowly accelerating rotation in a cylindrical container filled with3He-B. Owing to the long coherence length ξ(T, P)∼10–100 nm, either trapped remanent vorticity or intrinsic nucleation may dominate vortex formation, depending on the roughness of the container wall and the presence of loaded traps. NMR measurement with a resolution of one single vortex line allows us to distinguish between different processes: (1) Three extrinsic mechanisms of vortex formation have been observed. One of them is the vortex mill, a continuous periodic source which is activated in a rough-walled container well below the limit for intrinsic nucleation. (2) In a closed smooth-walled container intrinsic nucleation is the only mechanism available, with a critical velocity vc(T, P)=Ωc(T, P), whereR is the radius of the container. We findv c (T, P) to be related to the calculated intrinsic stability limitv ch (T, P) of homogeneous superflow. The existence of this connection in the form of a scaling law implies that nucleation takes place at an instability, rather than by thermal activation or quantum tunneling which become impossible because of an inaccessibly high energy barrier.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 107 (1997), S. 175-196 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report new measurements of the effective thermal conductivity Keff and relaxation time τ in dilute mixtures of3He in superfluid4He, with molar concentrationsX≤10−3. The temperature range extended fromT≈1.4 K toT λ. Both Kcff and τ are found to agree with theoretical predictions, in contrast to previous experiments where significant differences were observed. A new thermal conductivity cell design was used which almost completely eliminates extraneous volumes and surfaces, and the earlier results are explained in relation to these design changes.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 107 (1997), S. 197-208 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependencies of the magnetic susceptibility of Sc metal were measured between 0.1 mK and 10 mK parallel to the c-axis of single crystal in various small magnetic fields. From the magnetic field dependence of the magnetic susceptibility, the magnetic impurity effect on the magnetic property of Sc metal is discussed.
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  • 9
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the 16 Hz susceptibility of the diluted Van Vleck paramagnets Pr1−x Y x Ni5 withx=0.00, 0.05, 0.10. 0.20 at temperatures 1.5 K≤T≤50 K and magnetic fields up to 15T. Their Van Vleck type magnetic susceptibility χ(T, B, x) strongly depends on the field atB≥6 T. The temperatureT max(B, x) of the maximum of χ(T, B, x) decreases at increasing the field from zero to 15 T by approximately one order of magnitude for all Pr1−x Y x Ni5 compounds. Changing the dilutionx from zero to 0.20, the field whereT max(B, x) strongly drops is increased from 9 T to 11 T. Our data agree qualitatively with the predictions of a point charge model which considers the Zeeman term in addition to the electronic exchange and the dominating crystal field contributions.
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  • 10
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The analysis of the roughening transition proposed by Nozières and Gallet is extended to interfaces threaded with either randomly placed screw dislocations or dislocation loops. In both cases we consider a low density of dislocations which intersect normally with the surface leading to a local deformation of the crystal planes and to the formation of small steps in the interface. We show that dislocation loops do not change the roughening transition significantly: it still remains within the Kosterlitz-Thouless universality class of phase transitions. In contrast, randomly placed screw dislocations modify the phase transition: the Kosterlitz-Thouless transition is rounded on a length scale of order the spacing of dislocations. However there is a transition at a slightly lower temperature for randomly placed screw dislocations: the superroughening transition. This conclusion is only valid if the dislocations are randomly placed, not if they are distributed as closely spaced pairs of opposite sign.
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