Voltage-current properties of superconducting amorphous tungsten nanostrips

Sun, Yi; Wang, Jian; Zhao, Weiwei; Tian, Mingliang; Singh, Meenakshi; Chan, Moses H. W.

doi:10.1038/srep02307

Cited by 42 publications

(62 citation statements)

References 29 publications

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“…Sun et al . 45 estimated value larger than 8 T at 2 K. Through our resistance-temperature-magnetic field (RTH) experiments, we have also observed more than 8 T. Moreover, we carried out RTH experiments up-to 14 T, which has been performed for the first time on FIB-deposited W material and estimated . Note that the reported values are estimated using 90% resistance transition value and hence, cannot be compared with the value of parent pure W material.…”

Section: Discussionmentioning

confidence: 76%

Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies

Bhattacharyya

Awana

Senguttuvan

et al. 2018

Sci Rep

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Proximity-induced superconducting energy gap in the surface states of topological insulators has been predicted to host the much wanted Majorana fermions for fault-tolerant quantum computation. Recent theoretically proposed architectures for topological quantum computation via Majoranas are based on large networks of Kitaev’s one-dimensional quantum wires, which pose a huge experimental challenge in terms of scalability of the current single nanowire based devices. Here, we address this problem by realizing robust superconductivity in junctions of fabricated topological insulator (Bi2Se3) nanowires proximity-coupled to conventional s-wave superconducting (W) electrodes. Milling technique possesses great potential in fabrication of any desired shapes and structures at nanoscale level, and therefore can be effectively utilized to scale-up the existing single nanowire based design into nanowire based network architectures. We demonstrate the dominant role of ballistic topological surface states in propagating the long-range proximity induced superconducting order with high IcRN product in long Bi2Se3 junctions. Large upper critical magnetic fields exceeding the Chandrasekhar-Clogston limit suggests the existence of robust superconducting order with spin-triplet cooper pairing. An unconventional inverse dependence of IcRN product on the width of the nanowire junction was also observed.

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Section: Discussionmentioning

confidence: 76%

Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies

Bhattacharyya

Awana

Senguttuvan

et al. 2018

Sci Rep

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“…At T > T g , the sample is in the vortex-liquid state, the I–V curves exhibit ohmic behavior and the resistance remains constant even at small current I. Previous theoretical and experimental studies show that z = 4~7 and ν = 1~2 are reasonable values for the VG phase transition 27 . To obtain a good scaling performance, we have D = 2, ν = 1.9, and z = 4.2.…”

Section: Resultsmentioning

confidence: 87%

“…In VG theory, with the decrease in T, the mobile vortex (i.e., vortex-liquid state) will finally be pinned by the randomly distributed pinning centers, reaching the superconducting state (i.e., vortex-glass state). Therefore, the I–V curves at different temperatures near the liquid-glass phase transition temperature (T g ) can be scaled into two different branches by the scaling law 27–29 :where v is the exponent of the vortex-glass correlation length ξ g and ξ g diverges at T g as:z is the dynamical critical exponent, D is the number of dimensions, and f ± are the scaling functions above and below T g . Above T g , being in the vortex-liquid phase, there is a finite linear resistance for a low current limit I → 0 27 :and the I–V curve becomes nonlinear for large I.…”

Section: Resultsmentioning

confidence: 99%

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InN superconducting phase transition

Song

Shang

et al. 2019

Sci Rep

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InN superconductivity is very special among III–V semiconductors, as other III–V semiconductors (such as GaAs, GaN, InP, InAs, etc.) usually lack strong covalent bonding and thus seldom show superconductivity at low temperatures. Here, we probe the different superconducting phase transitions in InN highlighted by its microstructure. Those chemical-unstable phase-separated inclusions, such as metallic indium or In 2 O 3 , are intentionally removed by HCl acid etching. The quasi-two-dimensional vortex liquid-glass transition is observed in the sample with a large InN grain size. In contrast, the superconducting properties of InN with a small grain size are sensitive to acid etching, showing a transition into a nonzero resistance state when the temperature approaches zero. Since the value of ξ 0 (the zero-temperature-limit superconducting coherence length) is close to the grain size, it is suggested that individual InN grains and intergrain coupling should be responsible for the sample-dependent InN superconducting phase transition. Our work establishes a guideline for engineering superconductivity in III-nitride.

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“…This was recently studied theoretically and showed a rich phase diagram [52]. These W–C films are also convenient for fundamental studies regarding the nature of the vortex-glass to vortex-liquid transition under one-dimensional pinning potential given that previous studies in flat W–C films without artificial pinning have shown good scaling behavior [18]. Additionally, the W–C material could be the building block of arrays of superconducting islands on a normal metal, as was recently investigated for dynamic critical behavior studies [53].…”

Section: Resultsmentioning

confidence: 99%

Thickness-modulated tungsten–carbon superconducting nanostructures grown by focused ion beam induced deposition for vortex pinning up to high magnetic fields

Serrano¹,

Sesé²,

Guillamón³

et al. 2016

Beilstein J. Nanotechnol.

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We report efficient vortex pinning in thickness-modulated tungsten–carbon-based (W–C) nanostructures grown by focused ion beam induced deposition (FIBID). By using FIBID, W–C superconducting films have been created with thickness modulation properties exhibiting periodicity from 60 to 140 nm, leading to a strong pinning potential for the vortex lattice. This produces local minima in the resistivity up to high magnetic fields (2.2 T) in a broad temperature range due to commensurability effects between the pinning potential and the vortex lattice. The results show that the combination of single-step FIBID fabrication of superconducting nanostructures with built-in artificial pinning landscapes and the small intrinsic random pinning potential of this material produces strong periodic pinning potentials, maximizing the opportunities for the investigation of fundamental aspects in vortex science under changing external stimuli (e.g., temperature, magnetic field, electrical current).

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Voltage-current properties of superconducting amorphous tungsten nanostrips

Cited by 42 publications

References 29 publications

Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies

Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies

InN superconducting phase transition

Thickness-modulated tungsten–carbon superconducting nanostructures grown by focused ion beam induced deposition for vortex pinning up to high magnetic fields

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