Superconducting MgB2 Nanowires

Wu, Yiying; Messer, Benjamin; Yang, Peixu

doi:10.1002/1521-4095(200110)13:19<1487::aid-adma1487>3.0.co;2-q

Cited by 177 publications

(142 citation statements)

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“…15 Besides the metallic sheets and nanotubes there is a growing body of literature on semi-conducting boron nanostructures that are probably related to the known bulk crystal structures. [22][23][24][25][26] These developments indicate the rise of a very promising branch of nanoscience based on boron nanostructures. 26,27 Despite these early successes in the synthesis and characterization of BNTs, many questions on their structure and physical properties remain open and even their existence is still debated.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Atomic Structure of Single‐Wall Boron Nanotubes

Kunstmann

Bezugly

Rabbel

et al. 2014

Adv Funct Materials

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Despite recent successes in the synthesis of boron nanotubes (BNTs), the atomic arrangement of their walls has not yet been determined and many questions about their basic properties do remain. Here, we unveil the dynamical stability of BNTs by means of firstprinciples molecular dynamics simulations. We find that free-standing, single-wall BNTs with diameters larger than 0.6 nm are thermally stable at the experimentally reported synthesis temperature of 870 • C and higher. The walls of thermally stable BNTs are found to have a variety of different mixed triangular-hexagonal morphologies. Our results substantiate the importance of mixed triangular-hexagonal morphologies as a structural paradigm for atomically thin boron.

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Section: Introductionmentioning

confidence: 99%

Unveiling the Atomic Structure of Single‐Wall Boron Nanotubes

Kunstmann

Bezugly

Rabbel

et al. 2014

Adv Funct Materials

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“…This renders many superconductor NW fabrication methods 1,5,6,14,15 inapplicable, and so little has been reported in this area. Short HTS NWs (w ∼50 nm) have been synthesized, but superconductivity was only tested through magnetization measurements of powders of these materials.…”

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confidence: 99%

Long, Highly-Ordered High-Temperature Superconductor Nanowire Arrays

Heath

2008

Nano Lett.

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The preparation and electrical properties of high-temperature superconductor nanowire arrays are reported for the first time. YBa 2 Cu 3 O 7-δ nanowires with widths as small as 10 nm (much smaller than the magnetic penetration depth) and lengths up to 200 µm are studied by four-point electrical measurements. All nanowires exhibit a superconducting transition above liquid nitrogen temperature and a transition temperature width that depends strongly upon the nanowire dimensions. Nanowire size effects are systematically studied, and the results are modeled satisfactorily using phase-slip theories that generate reasonable parameters. These nanowires can function as superconducting nanoelectronic components over much wider temperature ranges as compared to conventional superconductor nanowires.A key question regarding the use of superconductors in nanoelectronic circuits is whether there is a critical size limit beyond which superconductivity can not be sustained. 1-3 A superconducting wire becomes quasi-one-dimensional (quasi-1D) when its width (w) is comparable to or smaller than the material-dependent Ginzburg-Landau coherence length (>∼100 nm for elemental superconductors) and magnetic penetration depth λ (∼40 nm for elemental superconductors). For bulk superconductors, the electrical resistance drops precipitously to zero below the superconducting transition temperature (T c ). For quasi-1D superconductors, the resistance decreases gradually below T c due to phase-slip processes. 2,4 This may result in resistive or insulating behaviors for thin (∼10 nm) wires when temperature approaches zero. 1,2 Narrow width (w ∼ 10 nm) nanowires (NWs) made from elemental superconductors 3,5-7 and from the binary alloy MoGe 1,2,8 are all quasi-1D systems, and strong suppression of superconductivity by phase-slip processes has been observed in these systems. The very low T c (typically below liquid helium temperature) limits their potential applications as zero-electrical resistance conductors or active components in nanoelectronic circuits. [8][9][10][11][12] In comparison, the short (∼1 nm) that characterizes high-temperature superconductor (HTS) materials 13 may reduce the influence on superconductivity of phase slip processes in HTS NWs, and the expected significantly higher T c should uniquely enable applications of HTS NW materials.However, achieving high-temperature superconductivity in NWs requires achieving the correct stoichiometry and the correct perovskite-like crystal structures of the HTS materials. This renders many superconductor NW fabrication methods 1,5,6,14,15 inapplicable, and so little has been reported in this area. Short HTS NWs (w ∼50 nm) have been synthesized, but superconductivity was only tested through magnetization measurements of powders of these materials. 16,17 Patterning HTS NWs from epitaxially grown HTS thin films is also challenging: HTS materials are unstable toward processing steps involving acid, water, or moderately elevated temperatures. In addition, for patterning, HTS films are...

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“…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. 10 Mesoscopic superconducting wires are also thick enough to support vortices, and thus they provide an interesting model system for investigating the coexistence and the interplay between the PSC-like structures (PSSs) and the Abrikosov vortex lattice.…”

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confidence: 99%