Enhancement of the superconducting transition temperature near a phase instability in NaxWO3

Shanks, H. R.

doi:10.1016/0038-1098(74)90254-3

Cited by 108 publications

(48 citation statements)

References 8 publications

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“…3(c) shows that the I c decreases with increasing V g away from 4 V, reminding one of the superconductivity dome phenomena [31][32][33][34][35]. The dome-shaped superconductivity is not restricted in oxide compounds, such as Na-doped WO 3 [31], KTaO 3 [32], and LaAlO 3 /SiTiO 3 interface [33], but also occurs in a band insulator, MoS 2 [34]. However, the mechanism behind the superconductivity dome is still under debate.…”

Section: Resultsmentioning

confidence: 98%

“…However, the mechanism behind the superconductivity dome is still under debate. It is attributed to the phonon softening from a structural transition in Na-doped WO 3 [31], and the quantum critical point in KTaO 3 and LaAlO 3 /SiTiO 3 interface [32,33], while Jianting Ye et al believed that there is a more universal and nonmaterial-related mechanism for the superconducting dome [34]. Considering the existence of both bulk and surface states in the Dirac semimetal nanowires, we proposed a mechanism related to the bulk-surface states interaction-induced dephasing for the observed superconducting dome.…”

Section: Resultsmentioning

confidence: 99%

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Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

Wang

et al. 2018

Phys. Rev. B

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A three-dimensional Dirac semimetal has bulk Dirac cones in all three momentum directions and Fermi arc like surface states, and can be converted into a Weyl semimetal by breaking time-reversal symmetry. However, the highly conductive bulk state usually hides the electronic transport from the surface state in Dirac semimetal. Here, we demonstrate the supercurrent carried by bulk and surface states in Nb-Cd 3 As 2 nanowire-Nb short and long junctions, respectively. For the ∼1-μm-long junction, the Fabry-Pérot interferences-induced oscillations of the critical supercurrent are observed, suggesting the ballistic transport of the surface states carried supercurrent, where the bulk states are decoherent and the topologically protected surface states still stay coherent. Moreover, a superconducting dome is observed in the long junction, which is attributed to the enhanced dephasing from the interaction between surface and bulk states as tuning gate voltage to increase the carrier density. The superconductivity of topological semimetal nanowire is promising for braiding of Majorana fermions toward topological quantum computing.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

Wang

et al. 2018

Phys. Rev. B

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“…Although sodium tungsten bronzes, Na V WO (0(x (1), have been known since long ago (1), they still attract considerable attention due to their unusual electronic-transport properties (2)(3)(4)(5). Their crystal structures were first investigated by Ha¨gg (6), who was able to show that a single cubic phase exists over the large composition range 0.32(x(1.…”

Section: Introductionmentioning

confidence: 99%

X-Ray and Electron Diffraction Study of the Tetragonal Sodium Tungsten Bronze, Na0.10WO3, with Distorted Perovskite Structure

Triantafyllou

Christidis

Lioutas

1997

Journal of Solid State Chemistry

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“…Low temperature superconductivity in Na x WO 3 has been known for a long time [2][3][4], and sheet superconductivity in WO 3−x was recently found by Aird and Salje [5]. Our current research relates to the possibility of wall superconductivity in Na x WO 3 .…”

Section: Introductionmentioning

confidence: 99%

“…The TI phase has a = 1.209 7 nm; c = 0.375 4 nm for x = 0.33 and a = 1.215 0 nm; c = 0.376 9 nm for x = 0.48 [15]. Shanks [2] has observed superconductivity in the tetragonal I phase with T c of up to 3 K, dependent on composition. The transition from tetragonal (II) to (I) involves a rotation some of the square perovskite units from the ideal cubic structure, forming triangular and pentagonal tunnels via cylindrical rotation faults.…”

Section: Introductionmentioning

confidence: 99%

Enhanced reactivity of domain walls in with sodium

Aird

Salje

2000

Eur. Phys. J. B

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A possible new high temperature superconducting phase was recently reported in WO3:Na. We have examined the reaction between sodium vapour and WO3, and compared the phases formed by the reaction to previously known WO3 phases. By using light microscopy and electron microprobe analysis, domain walls from the interior of the crystal are shown to have a much higher Na content than bulk material after reaction with Na vapour. This indicates preferential transport along the domain walls. The result is very similar to a reduction reaction of WO3 crystals in which twin walls lose oxygen preferentially. Oxygen deficient twin walls are superconducting with Tc ≈ 3 K. PACS. 61.72.Mm Grain and twin boundaries -66.30.-h Diffusion in solids -81.70.Jb Chemical composition analysis, chemical depth and dopant profiling

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Enhancement of the superconducting transition temperature near a phase instability in NaxWO3

Cited by 108 publications

References 8 publications

Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

X-Ray and Electron Diffraction Study of the Tetragonal Sodium Tungsten Bronze, Na0.10WO3, with Distorted Perovskite Structure

Enhanced reactivity of domain walls in with sodium

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