Fiske steps in annular Josephson junctions with trapped flux quanta

Nappi, C.; Cristiano, R.; Lisitskii, M. P.

doi:10.1103/physrevb.58.11685

Cited by 16 publications

(9 citation statements)

References 13 publications

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“…Similar patterns were reported by different groups [139][140][141]. The pattern shown in [142] or by the size of the junction [143]. So the experiments on the modulation pattern of the critical current in the single Josephson junction support the existence of the d-wave pairing symmetry.…”

Section: Fig 17supporting

confidence: 83%

Paramagnetic Meissner effect and related dynamical phenomena

2003

Physics Reports

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The hallmark of superconductivity is the diamagnetic response to external magnetic field. In striking contrast to this behavior, a paramagnetic response or paramagnetic Meissner effect was observed in ceramic high-Tc and in conventional superconductors. The present review is given on this interesting effect and related phenomena. We begin with a detailed discussion of experimental results on the paramagnetic Meissner effect in both granular and conventional superconductors. There are two main mechanisms leading to the paramagnetic response: the so called d-wave and the flux compression. In the first scenario, the Josephson critical current between two d-wave superconductors becomes negative or equivalently one has a π junction. The paramagnetic signal occurs due to the nonzero spontaneous supercurrent circulating in a loop consisting of odd number of π junctions. In addition to the d-wave mechanism we present the flux compression mechanism for the paramagnetic Meissner effect. The compression may be due to either an inhomogeneous superconducting transition or flux trap inside the giant vortex state. The flux trapping which acts like a total nonzero spontaneous magnetic moment causes the paramagnetic signal. The anisotropic pairing scenario is believed to be valid for granular materials while the flux trap one can be applied to both conventional and high-Tc superconductors. The study of different phenomena by a three-dimensional lattice model of randomly distributed π Josephson junctions with finite self-inductance occupies the main part of our review. By simulations one can show that the chiral glass phase in which chiralities are frozen in time and in space may occur in granular superconductors possessing d-wave pairing symmetry. Experimental attempts on the search for the chiral glass phase are analysed. Experiments on dynamical phenomena such as AC susceptibility, compensation effect, anomalous microwave absorption, aging effect, AC resistivity and enhancement of critical current by external electric fields are considered. These phenomena were studied by Monte Carlo and Langevin dynamics simulations which show satisfactory agreement with experiments. We present a resistively shunted junction model describing rich dynamics of Josephson junction networks.

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Section: Fig 17supporting

confidence: 83%

Paramagnetic Meissner effect and related dynamical phenomena

2003

Physics Reports

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“…The voltage position of the maximized Fiske resonance is determined by the number of trapped flux quanta. [5][6][7] We note that at values above a certain number of trapped flux quanta, the voltage position of the maximized Fiske resonance should exceed twice the superconducting energy gap, ⌬, freeing the quasiparticle branch of the current-voltage ͑I -V͒ characteristic from the presence of any Fiske resonance. The trapping of magnetic flux quanta eliminates the need for sustaining the external magnetic field during the detector working time and eliminates the problem of fluctuations and drifts of the magnetic field value.…”

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confidence: 86%

X-ray energy spectrum measurements by an annular superconducting tunnel junction with trapped magnetic flux quanta

Lisitskiy

Nappi

Ejrnæs

et al. 2004

Applied Physics Letters

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We report on the Fe55 x-ray pulse height spectrum of an annular superconducting tunnel junction (STJ) collected without an external magnetic field. An energy resolution of 100eV was obtained for the Kα line of the top electrode. The Josephson critical current and Fiske resonances were suppressed by the presence of trapped magnetic flux quanta which created a persistent current and self-generated magnetic field. The obtained energy resolution and the stability of the trapped magnetic flux under irradiation demonstrate the capability of an annular STJ device with trapped flux quanta to detect radiation without using the external magnetic field that is required in the conventional detection scheme.

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“…In particular, the dependence of the amplitudes of Fiske steps versus the applied magnetic field can be predicted [3]. In the course of the years this model has been generalized to more complex Josephson structures: two-dimensional JJs [4], annular JJs [5], SQUIDs or arrays of JJs [6], etc.…”

Section: Introductionmentioning

confidence: 99%