Josephson behavior in large-cross-section bridges of type I superconductor

Orlowski, M. C. L.; Buck, W.; Huebener, R. P.

doi:10.1007/bf00654643

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…This result agrees reasonably well with the experimental data represented in (6) and appears to confirm our interpretation. We note that the numerical value in (10) 2e Rim can be calculated from the data in Fig.…”

Section: Bridges Less Than 20/~m Wide Prepared By Photolithographysupporting

confidence: 82%

“…The results obtained with sample PI 11 from Ref. 6 can also be quoted in this connection. Figure 2 shows a series of V-I characteristics obtained with sample In25 for different ac amplitudes.…”

Section: Crossed Indium Strips and Remelting Of The Contact Areasmentioning

confidence: 70%

“…6 The application of the high-frequency ac component results in voltage steps in the current-voltage characteristics. The height of these steps is given by the Josephson relation…”

Section: Bridges Prepared By the Two-step Evaporationmentioning

confidence: 99%

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Josephson effect in indium bridges with large dimensions

Seifert

Huebener

1980

J Low Temp Phys

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We report experiments searching for Josephson behavior in indium bridges with dimensions in the following range: thickness 2-3 tzm ; length 3-15 txm ; width 10-100 tzm. Josephson behavior has been observed in bridges up to 20 tzm wide prepared by a single-step evaporation procedure and photolithography. In this case the V-I characteristics, including the rf-induced step structure, can be well described by the RSJ model if the amplitude of the applied rf current exceeds a distinct value. These results and in particular the magnitude and temperature dependence of the normal resistance of the Josephson element can be explained by the formation of an extended, "two-dimensional" phase slip center. Indium bridges prepared by a multiple-step evaporation method often show complicated behavior, the Yosephson effect being localized somewhere within a contamination layer separating the underlay films from the overlay film representing the bridge. Such multiple-step evaporation procedures should therefore be avoided.

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Section: Bridges Less Than 20/~m Wide Prepared By Photolithographysupporting

confidence: 82%

Section: Crossed Indium Strips and Remelting Of The Contact Areasmentioning

confidence: 70%

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Josephson effect in indium bridges with large dimensions

Seifert

Huebener

1980

J Low Temp Phys

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“…In the following we indicate the magnetic field associated with the flux tubes within the superconductor by a primed symbol and the magnetic field due to the applied current by an unprimed symbol. Describing the compensating field due to .N flux tubes within the superconductor by the total average flux d~N-, we have O~ r = 13 (Be -Be~) = a (I -Ien) (12) Here the coefficient/3 indicates the total flux within the superconductor necessary to compensate the excess field AB = Be-Be, at the edge. The coefficient a has a similar meaning and can be related to the differential resistivity dV/dI of the V(I) characteristics.…”

Section: Critical Entry Field and Flux-tube Nucleationmentioning

confidence: 99%

“…The coefficient a has a similar meaning and can be related to the differential resistivity dV/dI of the V(I) characteristics. Using (5), we have dV/dI = (l/b) d(c~iq~,~)/dI (13) Since ]Q and ~ can be approximated by constants in the current regimes of interest, we obtain with (12) dV/ dI = (N~./b ) dc~/ dI = agd b (14) Equation (14) 6). From this concept we can also understand the frequency independence observed in the V(f) characteristics for constant direct current (and constant excess field AB) at high frequencies (Figs.…”

Section: Critical Entry Field and Flux-tube Nucleationmentioning

confidence: 99%

Flux nucleation in the current-induced resistive state of a constricted type I superconductor

Selig

Huebener

1981

J Low Temp Phys

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The current-induced resistive state in a constricted type I superconductor is characterized by a train of flux tubes traversing the sample perpendicular to the direction of the applied current following its nucleation at the sample edge. The temporal structure of the nucleation process can be investigated by attempting to synchronize this process with small periodic current pulses superimposed on the direct bias current. The resistive dc voltage is then to be measured as a function of the pulse parameters such as frequency and width. We have performed such experiments at 4.2K on constricted Pb films of 6-8 tzm thickness and l O0 tzm width. Simultaneously with the electrical measurements the dynamic behavior of the flux tubes was directly observed using a stroboscopic magnetooptical method for magnetic flux detection. Our electrical measurements clearly show how the size of the nucleated flux tubes varies with the direct bias current and the nucleation frequency. The positive wall energy in the Pb films results in a lower limit for this size as expected. The influence of the preceding flux tubes still existing within the constriction upon the flux nucleation process is revealed in detail. All observations can be understood from a consideration of the energy balance during the flux nucleation process.

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Derivation of the Scattering Model for Josephson Effects from the Ginzburg‐Landau Equations

Orlowski

1982

Physica Status Solidi (b)

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The scattering model €or the Josephson effects as proposed some years ago is rigorously derived from the Ginzbnrg-Landau equations. Along these lines the validity o f the scattering model and new aspects of the present derivation are discussed. The derivation exhibits the relevance for the fermionic character of the Cooper electrons in the weak-link situation. Attention is called to the possible application of this model in field theories for dual string, Das vor einigen Jahren vorgeschlagene Streumodell zur Deutung der Josephson-Effekte wird aus der Ginzburg-Landau Theorie streng abgeleitet. Die Gdltigkeit des Modells und neu hinzugekommene Aspekte werden in diesem Zusammenhang diskutiert. Es wird besonders auf die mogliche Relevanz des fermionischen Chsrakters der Cooper-Elektronen w5hrend des Tunnelprozesses hingewiesen. Mogliche Anwendungsmogliehkeiten des Modells in Feldtheorien werden erliiutert.

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Josephson behavior in large-cross-section bridges of type I superconductor

Cited by 7 publications

References 16 publications

Josephson effect in indium bridges with large dimensions

Josephson effect in indium bridges with large dimensions

Flux nucleation in the current-induced resistive state of a constricted type I superconductor

Derivation of the Scattering Model for Josephson Effects from the Ginzburg‐Landau Equations

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