Wang<i>et al.</i>Reply:

Wang, H.; Rosario, M. M.; Kurz, N.; Rock, B. Y.; Tian, Mingliang; Carrigan, P. T.; Liu, Y.

doi:10.1103/physrevlett.101.229702

Cited by 39 publications

(60 citation statements)

References 4 publications

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“…When the radius R of the tube is smaller than the zerotemperature coherence length ͑0͒, the kinetic energy of the supercurrent exceeds the condensation energy around halfflux quanta of applied magnetic flux, ⌽ = ͑n +1/ 2͒⌽ 0 , and the periodic destruction of superconductivity at zero temperature occurs. 6 Recent realizations 7,8 of the Little-Parks experiment 9 with ultrathin aluminum tubes confirmed this prediction, however they also reported a multistep resistive transition with a temperature width that unexpectedly broadens when departing from the zero-field critical temperature T c ͑0͒.…”

Section: Introductionmentioning

confidence: 93%

Destruction of global coherence in long superconducting nanocylinders

Dao

Chibotaru

2009

Phys. Rev. B

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Recent experiments on long hollow nanocylinders have reported an anomalous broadening and a multistep character of the resistive transition between normal and superconducting states with increasing magnetic field. Here we show that a first-order phase separation is not the reason for such behavior since it can arise only for a wall thickness that is much larger than in the investigated samples ͑ϳ30 nm͒. On the contrary, it is found that the destruction of global coherence in the transition neighborhood should be triggered by intrinsic longrange inhomogeneities of the cylinder.

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Section: Introductionmentioning

confidence: 93%

Destruction of global coherence in long superconducting nanocylinders

Dao

Chibotaru

2009

Phys. Rev. B

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“…Investigation of phase slips induced by either thermal activation (TAPS) [1][2][3][4][5][6] or macroscopic quantum tunneling (MQT) [6][7][8][9][10] in superconducting nanowires has deepened our understanding of phase coherence at a macroscopic length scale. Work on doubly-connected superconductors, such as ultrathin hollow cylinders of superconductors prepared on an insulating cylindrical substrate -which were shown to exhibit both a destructive regime near half-integer flux quanta, [11][12][13] as predicted originally by de Gennes, 14 and a quantum phase transition near the onset of the destructive regime 12 has shown that sample topology plays an important role in determining the properties of nanoscale superconductors. The destructive regime is the Little-Parks effect 15 in the limit of an ultrasmall cylinder diameter.…”

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confidence: 96%

Single-crystal superconducting nanowires of NbSe2 fabricated by reactive plasma etching

Mills

Staley

Wisser

et al. 2014

Applied Physics Letters

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We present the preparation and measurements of nanowires of single-crystal NbSe2. These nanowires were prepared on ultrathin ( 10 nm) flakes of NbSe2 mechanically exfoliated from a bulk single crystal using a process combining electron beam lithography and reactive plasma etching. The electrical contacts to the nanowires were prepared using Ti/Au. Our technique, which overcomes several limitations of methods developed previously for fabricating superconducting nanowires, also allows for the preparation of complex superconducting nanostructures with a desired geometry. Current-voltage characteristics of individual superconducting single-crystal nanowires with widths down to 30 nm and cross-sectional areas as low as 270 nm 2 were measured for the first time.Nanoscale superconductors (wires, disks, loops, etc.) have long been a system of fundamental interest. Investigation of phase slips induced by either thermal activation (TAPS)1-6 or macroscopic quantum tunneling (MQT) 6-10 in superconducting nanowires has deepened our understanding of phase coherence at a macroscopic length scale. Work on doubly-connected superconductors, such as ultrathin hollow cylinders of superconductors prepared on an insulating cylindrical substrate -which were shown to exhibit both a destructive regime near half-integer flux quanta, 11-13 as predicted originally by de Gennes, 14 and a quantum phase transition near the onset of the destructive regime 12 -has shown that sample topology plays an important role in determining the properties of nanoscale superconductors. The destructive regime is the Little-Parks effect 15 in the limit of an ultrasmall cylinder diameter. Furthermore, planar doubly-connected superconducting nanostructures exhibit a Little-Parks-de Gennes effect in which the destructive regime is manipulated through sample geometry by adding a side branch to a superconducting nanoloop.

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“…The resulting two-step resistive transitions are different from the multi-step resistive transitions observed earlier in amorphous superconducting films and wires, which are attributed to an inhomogeneous superconducting phase or a phase separation in the superconducting state. 25,26 Page 17 of 27 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 19 To understand the resistive transitions in more detail, we have analyzed the measured R(T) curves in terms of the theoretical models of the Berezinskii-Kosterlitz-Thouless (...…”

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confidence: 97%

Unique Domain Structure of Two-Dimensional α-Mo₂C Superconducting Crystals

et al. 2016

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The properties of two-dimensional (2D) materials such as graphene and monolayer transition metal dichalcogenides are strongly influenced by domain boundaries. Ultrathin transition metal carbides are a class of newly emerging 2D materials that are superconducting and have many potential applications such as in electrochemical energy storage, catalysis, and thermoelectric energy conversion. However, little is known about their domain structure and the influence of domain boundaries on their properties. Here we use atomic-resolution scanning transmission electron microscopy combined with large-scale diffraction-filtered imaging to study the microstructure of chemical vapor deposited high-quality 2D α-Mo2C superconducting crystals of different regular shapes including triangles, rectangles, hexagons, octagons, nonagons, and dodecagons. The Mo atom sublattice in all these crystals has a uniform hexagonal closely packed arrangement without any boundaries. However, except for rectangular and octagonal crystals, the C atom sublattices are composed of three or six domains with rotational-symmetry and well-defined line-shaped domain boundaries because of the presence of three equivalent off-center directions of interstitial carbon atoms in Mo octahedra. We found that there is very small lattice shear strain across the domain boundary. In contrast to the single sharp transition observed in single-domain crystals, transport studies across domain boundaries show a broad resistive superconducting transition with two distinct transition processes due to the formation of localized phase slip events within the boundaries, indicating a significant influence of the boundary on 2D superconductivity. These findings provide new understandings on not only the microstructure of 2D transition metal carbides but also the intrinsic influence of domain boundaries on 2D superconductivity.

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Wanget al.Reply:

Cited by 39 publications

References 4 publications

Destruction of global coherence in long superconducting nanocylinders

Destruction of global coherence in long superconducting nanocylinders

Single-crystal superconducting nanowires of NbSe2 fabricated by reactive plasma etching

Unique Domain Structure of Two-Dimensional α-Mo₂C Superconducting Crystals

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Wanget al.Reply:

Cited by 39 publications

References 4 publications

Destruction of global coherence in long superconducting nanocylinders

Destruction of global coherence in long superconducting nanocylinders

Single-crystal superconducting nanowires of NbSe2 fabricated by reactive plasma etching

Unique Domain Structure of Two-Dimensional α-Mo2C Superconducting Crystals

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Product

Resources

About

Unique Domain Structure of Two-Dimensional α-Mo₂C Superconducting Crystals