Whiskers from the In-Pb system: Growth, handling and characteristic properties

Werner, T.; Tidecks, R.; Johnston, Brent

doi:10.1016/0022-0248(85)90010-7

Cited by 23 publications

(6 citation statements)

References 38 publications

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“…Nevertheless, the penetration depth of ~1848 nm calculated above is significantly larger than the sample thickness, satisfying the condition required for quasi-1D superconductivity in type-II superconductors 17 , 38 . Also, from previous experiments on quasi-1D superconducting nanowires, the diameter of the systems ranges from 10 to 1000 nm 32 , 34 , 38 , 47 – 49 and our sample thickness is within that range. We need to further mention that the unique weak coupled Ta-S chains 19 , 27 , 50 along the b -axis, which are responsible for the superconductivity also make the superconductivity in Ta 2 PdS 5 nanowires quasi-1D 39 , 51 .…”

Section: Discussionsupporting

confidence: 52%

Signature of quantum Griffiths singularity state in a layered quasi-one-dimensional superconductor

et al. 2018

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Quantum Griffiths singularity was theoretically proposed to interpret the phenomenon of divergent dynamical exponent in quantum phase transitions. It has been discovered experimentally in three-dimensional (3D) magnetic metal systems and two-dimensional (2D) superconductors. But, whether this state exists in lower dimensional systems remains elusive. Here, we report the signature of quantum Griffiths singularity state in quasi-one-dimensional (1D) Ta2PdS5 nanowires. The superconducting critical field shows a strong anisotropic behavior and a violation of the Pauli limit in a parallel magnetic field configuration. Current-voltage measurements exhibit hysteresis loops and a series of multiple voltage steps in transition to the normal state, indicating a quasi-1D nature of the superconductivity. Surprisingly, the nanowire undergoes a superconductor-metal transition when the magnetic field increases. Upon approaching the zero-temperature quantum critical point, the system uncovers the signature of the quantum Griffiths singularity state arising from enhanced quenched disorders, where the dynamical critical exponent becomes diverging rather than being constant.

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Section: Discussionsupporting

confidence: 52%

Signature of quantum Griffiths singularity state in a layered quasi-one-dimensional superconductor

et al. 2018

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“…The voltage steps seen in Sn nanowires are reminiscent of those observed previously in Sn whiskers [7][8][9]28 , but the steps in whiskers can be seen only in a very narrow temperature region (∆T~0.1 K) below the T c . They were interpreted as a consequence of spatially localized "weak spots" r phase slip centers (PSCs) 29,30 .…”

supporting

confidence: 69%

“…The RRR of our singlecrystal wires at 9 is 4 to 5 times larger than polycrystalline Zn and Au wires of comparable diameter fabricated and measured with similar techniques. A RRR ratio of 9, however is an order of magnitude smaller than those of indium, tin, and lead whiskers [8][9][10] . There are a number of possible reasons for the reduced RRR.…”

mentioning

confidence: 84%

“…A schematic of our experimental arrangement is shown as an inset of Fig.2 (a). This arrangement is very similar to the technique used for transport measurement of superconducting whiskers [7][8][9] . The whiskers were held by two electrically isolated superconducting blocks of Wood's metal, enabling twoprobe measurements.…”

mentioning

confidence: 99%

“…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][8][9][10] . At such a length scale, 1d behavior is unlikely to be evident except at temperatures very close to T c .…”

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confidence: 99%

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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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Pb based alloys and compounds

Yu¹,

Kaner²

O (Without Cuprates) - Sc

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Whiskers from the In-Pb system: Growth, handling and characteristic properties

Cited by 23 publications

References 38 publications

Signature of quantum Griffiths singularity state in a layered quasi-one-dimensional superconductor

Signature of quantum Griffiths singularity state in a layered quasi-one-dimensional superconductor

Dissipation in quasi-one-dimensional superconducting single-crystalSnnanowires

Pb based alloys and compounds

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