Hysteresis of vanadium-insulation-lead Josephson tunnel junctions

Dettmann, F.

doi:10.1002/pssa.2210280151

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Later Dettman [23] evaluated the same ratio, using a freeelectron-gas model for the valence electrons and Hartree-Fock wave functions for the core electrons. In the high-velocity limit, Dettman predicts the same ratio as does eq.…”

Section: Random Energy Loss Density Effect and Stragglingmentioning

confidence: 99%

Some Energy-Loss and Channeling Phenomena for GeV Particles

Uggerhøj¹

1983

Phys. Scr.

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Energy-loss measurements for 2-15 GeV positive and negative protons, kaons, pions, and electrons transmitted through thin Si and Ge crystals acting as intrinsic detectors are discussed. For the random direction, the results are compared with the relativistic Bethe-Bloch stopping theory with and without restrictions. The strong influence of density effect is included through the Sternheimer calculations. The most probable energy loss clearly saturates at the "Fermi plateau", which is completely constant up to the maximum y value (2 X lo4) investigated here. The spectral distribution of energy losses is considerably wider than the Landau distributions, especially for very thin (--100pm) targets but is in good agreement with sbaggling calculations based on photoabsorption cross sections. For axial and planar directions in the crystals, positive particles show considerably reduced energy loss as compared to random, and the results are in good agreement with the Esbensen and Golovchenko calculations. Axially channeled negative particles show an increase in energy loss by as much as 20%, as compared to random. The influence of relativistic effects on channeling phenomena is introduced through a short discussion of the fist electron/positron experiments, where the basic features of the effects were explored, and the results are compared to yields from closeencounter processes for heavy GeV particles. The experimental results have been compared to calculated-yield curves based on the Lindhard channeling model, and very good agreement is found over the enormous range of five to six orders of magnitude in momenta. The strong influence of channeling on smallangle scattering for GeV particles is considered through a discussion of multiple scattering, dechanneling, and the so-called "doughnut effect". The latter, in which the correlated scattering from atomic rows results in ring-shaped intensity distributions on the exit side, is found to exist for angles of incidence far beyond the critical angle, $ This shows that the continuum description in the GeV region can be used for angles of incidence large compared to J1 Radiation from 2-55 GeV/c planar-channeled electrons and positrons has been measured and compared to classical calculations based on harmonic and more realistic anharmonic potentials and for cases, where the dipolarity condition is not satisfied. For positrons, it is found that for certain incident momenta between 1 and 10GeV/c, the channeling radiation is practically independent of transverse energy, resulting in very sharp peaks in the spectra. This offers the possibility of making strong, nearly monoenergetic y sources in the energy range of 1-100MeV. Finally, a few applications of highenergy channeling in investigations of inner-shell excitations and &ray yields are discussed, together with some recent results on the use of channeling for bending of GeV beams.

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Section: Random Energy Loss Density Effect and Stragglingmentioning

confidence: 99%

Some Energy-Loss and Channeling Phenomena for GeV Particles

Uggerhøj¹

1983

Phys. Scr.

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“…Also the complete or partial extension of these results to encompass a more broader class of geometries might prove difficult, and in these cases a numerical approach is needed. Recent works have also investigated the connection between the dynamics at the microscopic level and macroscopic transport properties, in particular how transport takes place in chaotic and non-chaotic systems [16,17], or the identification of several transport regimes (e.g. diffusive, superdiffusive, etc.)…”

Section: Introductionmentioning

confidence: 99%

Ergodicity of a Single Particle Confined in a Nanopore

et al. 2012

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We analyze the dynamics of a gas particle moving through a nanopore of adjustable width with particular emphasis on ergodicity. We give a measure of the portion of phase space that is characterized by quasiperiodic trajectories which break ergodicity. The interactions between particle and wall atoms are mediated by a Lennard-Jones potential, so that an analytical treatment of the dynamics is not feasible, but making the system more physically realistic. In view of recent studies, which proved non-ergodicity for systems with scatterers interacting via smooth potentials, we find that the non-ergodic component of the phase space for energy levels typical of experiments, is surprisingly small, i.e. we conclude that the ergodic hypothesis is a reasonable approximation even for a single particle trapped in a nanopore.

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Properties of quantum interference devices with VVOxPb tunnel junctions

Dettmann

1978

Phys. Stat. Sol. (a)

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The properties of double contact quantum interference devices (SQUIDs) with VVOxPb tunnel juctions are studied experimentally. With decreasing temperature an increasing hysteresis in the (I‐U) characteristics is observed. At lower temperatures there are multiple critical currents. At sufficiently low inductivities of the SQUID loop and small critical currents single valued critical currents can be reached. The dependences of the quantum interferences from magnetic field and from the temperature pointed out that small tunnel areas and a symmetric construction of the SQUID loop are advantageous.

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Hysteresis of vanadium-insulation-lead Josephson tunnel junctions

Cited by 4 publications

References 6 publications

Some Energy-Loss and Channeling Phenomena for GeV Particles

Some Energy-Loss and Channeling Phenomena for GeV Particles

Ergodicity of a Single Particle Confined in a Nanopore

Properties of quantum interference devices with VVOxPb tunnel junctions

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