Current–voltage characteristics of Pb and Sn granular superconducting nanowires

Michotte, Sébastien; Mátéfi‐Tempfli, Stefan; Piraux, Luc

doi:10.1063/1.1582356

Cited by 63 publications

(71 citation statements)

References 10 publications

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“…The whiskers were held by two electrically isolated superconducting blocks of Wood's metal, enabling twoprobe measurements. There are reports of two-lead transport measurements on Au-capped polycrystalline Pb and Sn nanowires also embedded inside the membrane 12,14 . The wires are also fabricated by electrodeposition technique.…”

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Dissipation in quasi-one-dimensional superconducting single-crystalSnnanowires

et al. 2005

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Electrical transport measurements were made on single-crystal Sn nanowires to understand the intrinsic dissipation mechanisms of a one-dimensional superconductor. While the resistance of wires of diameter larger than 70 nm drops precipitately to zero at T c near 3.7 K, a residual resistive tail extending down to low temperature is found for wires with diameters of 20 and 40 nm. As a function of temperature, the logarithm of the residual resistance appears as two linear sections, one within a few tenths of a degree below T c and the other extending down to at least 0.47 K, the minimum temperature of the measurements. The residual resistance is found to be ohmic at all temperatures below T c of Sn. These findings are suggestive of a thermally activated phase slip process near T c and quantum fluctuation-induced phase slip process in the low temperature regime. When the excitation current exceeds a critical value, the voltage-current (V-I) curves show a series of discrete steps in approaching the normal state. These steps cannot be fully understood with the classical Skocpol-Beasley-Tinkham phase slip center model (PSC), but can be qualitatively accounted for partly by the PSC model modified by Michotte et al. PACS numbers: 74.78.Na, 73.63.Nm When the diameter of a superconducting wire is smaller than the phase coherence length, ξ (T), its behavior is expected to deviate from that of bulk and crosses over towards that expected of a quasi onedimensional (1d) system. In spite of extensive experimental studies over the last three decades, there are still controversies on what are the expected properties of a 1d superconductor [1][2][3][4][5][6] . A major reason for the uncertainties is the variety of microstructure and morphology of the samples used in the experiments. Indeed, contrasting results are found in granular 1 , polycrystalline 2 and amorphous wires 3-6 fabricated by sputtering or evaporating techniques. Measurements on single-crystal nanowires with uniform diameter would be ideal to single out the effect of 1d confinement. To date, such measurements were carried out only on crystalline superconducting whiskers with diameters ranging from 0.1 to 0.8 µm 7-10 . At such a length scale, 1d behavior is unlikely to be evident except at temperatures very close to T c .In this paper we present a systematic study of the transport properties of single-crystal cylindrical tin (Sn) nanowires with diameters between 20 and 100 nm. We chose tin in our study because the coherence length of bulk tin is relatively long (ξ (0)~200 nm) and singlecrystal nanowires of uniform diameter can be consistently prepared by a simple template-assembly technique 11 . Our results show a clear crossover from bulk-like to probably quasi 1d-like behavior when the diameter of the wires is reduced to 40 nm (5 times smaller than the bulk coherence length). Two different dissipative processes, i.e., thermally activated phase slip (TAPS) close to T c and quantum phase-slip (QPS) at temperatures far below T c are clearly observed for the wires ...

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“…For PCM membranes, the pore density is about 6×10 8 pores/cm 2 , two orders lower than that of AAM. The pores in PCM are randomly distributed 12 . Fig.1(c) and 1(d), respectively, show the images of the resulting nanowires fabricated with PCM, characterized by transmission electron microscopy (TEM) and by electron diffraction (ED) measurements.…”

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Dissipation in quasi-one-dimensional superconducting single-crystalSnnanowires

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“…nanostructured materials have yielded a variety of 1D superconductors, including electrodeposited Pb and Sn nanowires, 4 nanotube-templated amorphous MoGe 5 and Nb 6 nanowires, lithographically-defined 7 and laser-ablated 8 YBa 2 Cu 3 O 7-δ nanowires, and MgB 2 nanowires. 9 Mesoscopic wires and strips, with one or more dimensions wider than ξ, can also exhibit PSC-like V steps, attributable to Josephson weak-links and spatially-extended PSCs.…”

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Magnetic switching of phase-slip dissipation inNbSe2nanoribbons

et al. 2007

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“…One can see that the critical temperature is near the bulk T c value of lead ͑7.2 K͒ and also that of pure Pb nanowires. 10 Though the relatively wide resistive transitions can be attributed to thermally activated phase slips, 11 part of the broadening is also certainly due to the small depression of T c at the N/S boundaries in the limit of thick superconducting layers.…”

Section: Fabrication and Physical Properties Of Pb/ Cu Multilayered Smentioning

confidence: 99%

“…10 Indeed, in addition to the thick gold cathode from which the nanowires start to grow inside the pores, another contacting gold layer is deposited on the other side exposed to the electrolyte. This contacting layer is thin enough to ensure that it does not close the pores, so they can be filled by the electrolyte.…”

Section: Fabrication and Physical Properties Of Pb/ Cu Multilayered Smentioning

confidence: 99%

Fabrication and physical properties of Pb∕Cu multilayered superconducting nanowires

Horne

Piraux

Michotte

2005

Applied Physics Letters

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Using nanoporous media as templates for electrodeposition, we have fabricated multilayered Pb/Cu nanowires 50 nm in diameter and 20 μ m long with Cu layer thicknesses as low as 10 nm. This was achieved by using a singlebath technique and a precise selection of the copper deposition potential to limit the redissolution of lead when the potential is raised to electrodeposit the more noble metal. Such superconductor/normal multilayered nanowires show interesting magnetoresistance properties at a low magnetic field that may be related to the proximity effect, which can therefore be investigated in a quasi-onedimensional geometry.

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Current–voltage characteristics of Pb and Sn granular superconducting nanowires

Cited by 63 publications

References 10 publications

Dissipation in quasi-one-dimensional superconducting single-crystalSnnanowires

Dissipation in quasi-one-dimensional superconducting single-crystalSnnanowires

Magnetic switching of phase-slip dissipation inNbSe2nanoribbons

Fabrication and physical properties of Pb∕Cu multilayered superconducting nanowires

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