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Josephson effect in cuprate superconducting structures
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View: Figures


Image of FIG. 1.
FIG. 1.

Phase dependence of the Andreev levels in the tunnel junctions of S-superconductors (solid line) and low-energy Andreev levels of D-superconductors (dotted line) in the transparency of the boundary D = 0.1. The inset shows a diagram of the bicrystal junction of two D-superconductors with a symmetrical misorientation of axes and the direction of incidence of electrons and holes.

Image of FIG. 2.
FIG. 2.

The dependence of energies of the Andreev levels on the angle of incidence θ of quasiparticles with phase difference ϕ = π for three values of angle α, which is the angle of misorientation of bicrystal rotational junctions of D-superconductors

Image of FIG. 3.
FIG. 3.

Schematic representation of two types of bicrystal junctions: rotational (a) and tilted (b). The solid line indicates the bicrystal boundary, dotted line – the normal to the boundary or the plane of the substrate, shading is used to show the direction of the layers in cuprate superconductors.

Image of FIG. 4.
FIG. 4.

Current-voltage characteristics of the bicrystal junction at T = 4.2 K. The inset on the left shows temperature dependences of the critical current Ic (T) and the resistance of the junction. The inset on the right shows the dependence of the critical current (jc ) density on the characteristic resistance of the boundary RNS.

Image of FIG. 5.
FIG. 5.

Dependences of the Shapiro steps (the first n = 1 and the fractional n = 1/2) on the amplitude of the external electromagnetic radiation of frequency fe  = 100 GHz when T = 4.2 K for two tilt angles of the bridge forming the TBJ. The dotted line represents dependences calculated within the framework of the resistive model for IS (ϕ) = Ic sinϕ, the solid line represents IS (ϕ) = (1−q)Ic sinϕ + qIc sin 2ϕ, q = 0.2. The inset shows the corresponding dependences of IS (ϕ) for q = 0.2 (solid line) and q = 0 (dotted line).

Image of FIG. 6.
FIG. 6.

Current-voltage characteristics for a symmetrical RBJ at T = 4.2 K (dotted line) and the noise power PN (V), given in degrees Kelvin (solid line). The dot-dashed line represents the dependence of shot noise TSH (V) = (e/2kB )I(V)RD . The inset shows the dependence of the effective charge Q(V) = SI (V)/2I in units of electron charge.

Image of FIG. 7.
FIG. 7.

(a) Cross section of the heterostructure with an AF (CSCO) interlayer, marked with the letter M. The thicknesses of the layers: YBCO–200 nm, CSCO–20-50 nm, Au–10-20 nm, Nb–200 nm. (b) A photograph of HMS from the top. The light color represents superconducting electrodes of the log-periodic antenna.

Image of FIG. 8.
FIG. 8.

Experimental data on the dependence of the density of superconducting current on the thickness for an HMS with an interlayer of CSCO (stars) x = 0.5. Filled circles correspond to heterotransitions without the M-interlayer. The dashed lines show the theoretical dependences of critical current on the thickness of the AF-interlayer for three values of normalized exchange field H exkBT: 2 (1), 5 (2), 10 (3). The normalization of the theoretical dependence in the critical current value and the interlayer thickness was chosen from the condition of best fit to the theory of experiment ξ AF  = 10 nm.

Image of FIG. 9.
FIG. 9.

(a) The family of CVC HMS at various values of the power of microwave impact and T = 4.2 K. The thin line shows the envelope of the critical current, arrows show the first (hfe /2 e) and fractional (hfe /4 e) Shapiro steps. (b) The dependence of critical current Ic (circles) and the first Shapiro step I 1 (triangles) on the normalized amplitude Ie /Ic of external influence of millimeter radiation with frequency of 56 GHz for T = 4.2 K. The dashed line shows the theoretical dependence I 1(Ie /Ic ), obtained from the resistive model of JJ. The solid line shows the calculated dependences calculated with the second CPR harmonic in mind for q = 0.2.

Image of FIG. 10.
FIG. 10.

(a) The magnetic field dependence of the critical current Ic (H) (circles) for a HMS containing CSCO (x = 0.5), dM  = 50 nm, and L = 10 μm at T = 4.2 K. The solid line represents the dependence of Eq. (3) under the normalization Ic (0) = Ic 0. Dashed line shows calculated Fraunhofer dependence for L = 10 μm and London penetration depths λ L 1 = 150 nm and λ L 2 = 90 nm for YBCO and Nb, respectively. Filled circles – experimental data for a heterostructure without AF-interlayer with L = 50 μm. Inset: model50 for an S–AF–S JJ. (b) Dependence of the first minimum H 1 on the magnitude of HMS: without an AF-interlayer for a perpendicularly directed field (◯), for the parallel field (•); HMS with dM  = 50 nm for a perpendicular field (□), for a parallel field (▪), dM  = 20 nm (▵); solid line—approximation of the 1/L type.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Josephson effect in cuprate superconducting structures