Superconductivity in Coupled Pb/Ge and Pb/C Multilayers

Locquet, Jean‐Pierre; Neerinck, D.; Vanderstraeten, H.; Sevenhans, W.; Haesendonck, C. Van; Bruynseraede, Y.; Homma, H.; Schuller, Iván K.

doi:10.7567/jjaps.26s3.1431

Cited by 15 publications

(6 citation statements)

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“…The 3D-2D crossover was observed experimentally for various types of superconducting multilayers having different structures such as superconductorinsulator-superconductor ͑SIS͒, e.g., Pb/C, 12 superconductorsemiconductor-superconductor, e.g., Nb/Ge, 13 superconductor-normal-metal-superconductor ͑SNS͒, e.g., Nb/Cu, [14][15][16] V/Ag, 17 and V/Cu, 18,19 superconductormagnetic-metal-superconductor ͑SMS͒, e.g., V/Ni, 20 and superconductor-superconductorЈ-superconductor ͑SSЈS͒, e.g., Nb/NbTi, 21 and Nb/NbZr, 22 and some other. In all the mentioned cases, independent of the structure of the multilayers a linear-to-square root transition in the temperature dependence of the upper critical field parallel to layers, H c2 ʈ (T), was observed, representing the 3D-2D crossover.…”

Section: Introductionmentioning

confidence: 94%

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Magnetic field decoupling and 3D-2D crossover in Nb/Cu multilayers

et al. 1996

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Transport properties of Nb/Cu multilayers were measured along and across layers. It is shown that not only the temperature but also the magnetic field parallel to layers can effectively decouple layers and cause the three-to-two-dimensional ͑3D-2D͒ crossover. As a consequence of the 3D-2D crossover, sharpening of the resistive transition with current along layers occurs due to the appearance of a strong intrinsic pinning in the 2D state. Evidence for the intrinsic Josephson effect in the 2D state is provided both by the periodic modulation of the dynamic resistance across layers versus the parallel magnetic field and by the multiply branched I-V curves caused by flux-flow of Josephson vortices in the stacked superconductor-normal-metal-superconductor junctions composing the multilayer. By measurements across layers the ''breaking field'' at which the proximity induced superconductivity in the normal layers of superconductor-normal-metal ͑Nb/Cu͒ multilayers is destroyed was observed directly. A dimensionality diagram in the (H-T) plane was deduced from our data. Reasons for complication of the ''Fraunhofer pattern,'' I c (H), in ''long'' multilayers are discussed.

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Section: Introductionmentioning

confidence: 94%

“…͑i͒ Linear-to-square root transition in H c2 ʈ (T). [12][13][14][15][16][17][18][19][20][21][22] As it follows from the LD model in the vicinity of T c , the ML behaves as a 3D anisotropic superconductor with linear temperature dependence of H c2…”

Section: Introductionmentioning

confidence: 99%

Magnetic field decoupling and 3D-2D crossover in Nb/Cu multilayers

et al. 1996

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“…In particular, the dimensional crossover in the temperature dependence of the parallel critical field was theoretically predicted [2] and experimentally observed in a number of multilayers, e.g. Nb/Cu [3],V/Ag [4],Nb/Ge [5],Pb/Ge [6].…”

Section: Introductionmentioning

confidence: 86%

Spatial evolution of cooperative Raman scattering

Андреев¹,

Ilinskii²,

Mkoyan³

1989

Sov. J. Quantum Electron.

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We have compared the parallel (Hc211) and perpendicular (&) upper critical field of superconducting multilayers with strong and weak interlayer coupling (Pb/Cu, Pb/Ge). The temperature dependence of Hc21/ reflects the expected dimensionality of the multilayers and can be interpreted in terms of the Takahashi-Tachiki proximity coupling model. In contrast with the strongly coupled Pb/Cu multilayers, weakly coupled Pb/Ge multilayers exhibit a strong thickness dependence of Hc2i. The electronic diffusion coefficient in Pb/Ge, obtained from Hc21 data, is not in agreement with the value calculated from the normal state resistivity. The disagreement reflects the highly inhomogeneous nature of the weakly coupled Pb/Ge multilayers.

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“…In recent years, the structural analysis of multilayers has received considerable attention [l]. The details of the structure of the individual components and the interface are often crucial for the understanding of the superconducting [2] and magnetic [3] properties of the multilayers. It has also been shown that the structure of the interface plays a dominant role in the melting [4] or crystallisation [5] behaviour of one of the components.…”

Section: Introductionmentioning

confidence: 99%

Finite size effects in crystalline/amorphous multilayers

Neerinck

Vanderstraeten

Stockman

et al. 1990

J. Phys.: Condens. Matter

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Extended x-ray diffraction experiments have been used to investigate the structure of Pb/Ge multilayers with asmall (<15) number of bilayers. The detailed finite size structure in the x-ray diffraction profiles indicates that the multilayers are of very high quality. We present a one-dimensional kinematical calculation for these diffraction profiles, including continuous and discrete random fluctuations in layer thickness. The introduction of both continuous and discrete fluctuations causes a decrease in the number of secondary singlelayer 'finite size' maximain the high angle region, in agreement with the experimental results. No quantitative agreement is reached for the low angle region, which shows more finite size structure than predicted by the fluctuations deduced from the high angle region.

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Superconductivity in Coupled Pb/Ge and Pb/C Multilayers

Cited by 15 publications

References 0 publications

Magnetic field decoupling and 3D-2D crossover in Nb/Cu multilayers

Magnetic field decoupling and 3D-2D crossover in Nb/Cu multilayers

Spatial evolution of cooperative Raman scattering

Finite size effects in crystalline/amorphous multilayers

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