Current-induced depairing in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:mi mathvariant="normal">FeTe</mml:mi></mml:mrow></mml:math>interfacial superconductor

Kunchur, Milind N.; Dean, Charles L.; Moghadam, Nasrollah; Knight, J. M.; He, Qinglin; Liu, Hong‐Chao; Wang, Jiannong; Lortz, Rolf; Sou, Iam Keong; Gurevich, A.

doi:10.1103/physrevb.92.094502

Cited by 19 publications

(9 citation statements)

References 23 publications

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“…4(c,f)), U exhibits a logarithmic dependence on the magnetic field, U = U 0 ln( H 0 / H ), with H 0 ≈ H c2 , as observed in other 2D systems484950. This observation of a 2D vortex system is consistent with the earlier report of the Berezinsky-Kosterlitz-Thouless transition in the Bi 2 Te 3 /FeTe interface3351. For both Bi 2 Te 3 (7 nm)/FeTe and Bi 2 Te 3 (14 nm)/FeTe samples, the fitted value of H 0 decreases after two years’ air exposure as displayed in Fig.…”

Section: Resultssupporting

confidence: 89%

Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures

Liu

et al. 2016

Sci Rep

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The discovery of two-dimensional superconductivity in Bi2Te3/FeTe heterostructures provides a new platform for the search of Majorana fermions in condensed matter systems. Since Majorana fermions are expected to reside at the core of the vortices, a close examination of the vortex dynamics in superconducting interface is of paramount importance. Here, we report the robustness of the interfacial superconductivity and 2D vortex dynamics in four as-grown and aged Bi2Te3/FeTe heterostructure with different Bi2Te3 epilayer thickness (3, 5, 7, 14 nm). After two years’ air exposure, superconductivity remains robust even when the thickness of Bi2Te3 epilayer is down to 3 nm. Meanwhile, a new feature at ~13 K is induced in the aged samples, and the high field studies reveal its relevance to superconductivity. The resistance of all as-grown and aged heterostructures, just below the superconducting transition temperature follows the Arrhenius relation, indicating the thermally activated flux flow behavior at the interface of Bi2Te3 and FeTe. Moreover, the activation energy exhibits a logarithmic dependence on the magnetic field, providing a compelling evidence for the 2D vortex dynamics in this novel system. The weak disorder associated with aging-induced Te vacancies is possibly responsible for these observed phenomena.

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Section: Resultssupporting

confidence: 89%

Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures

Liu

et al. 2016

Sci Rep

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“…A numerical calculation shows that this happens at k = 0.128. Taking λ = 124 × 10 −9 m and ξ = 4.4 × 10 −9 / m [12,19], this translates to a current density j = 6.28 × 10 9 A/m 2 . For our sample dimensions of w = 11.6 μm and d = 7 nm, we get a current I V P B =0.509 mA, in good agreement with the observed…”

Section: Resultsmentioning

confidence: 99%

“…This is the regular (Cooper) pairbreaking (depairing) regime; here the depairing current I d (∼0.1 A) signals entry into the normal state, upon which R(I) saturates to a constant (residual) value. A detailed investigation of the upper depairing regime was conducted in our earlier work [19]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Current driven vortex-antivortex pair breaking and vortex explosion in the Bi2Te3/FeTe interfacial superconductor

Dean

Kunchur

et al. 2016

Physica C: Superconductivity and its Applications

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We investigated the dissipative regime of the Bi 2 Te 3 /FeTe topological insulatorchalcogenide interface superconductor at temperatures well below the Berezinski-Kosterlitz-Thouless transition. We observe a transition in the current-resistance and temperature-resistance curves that quantitatively agrees with the Likharev vortex-explosion phenomenon. In the limit of low temperatures and high current densities, we were able to demonstrate the regime of complete vortex-antivortex dissociation arising from current driven vortex-antivortex pair breaking.

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“…Mg is a lightweight metal with a density slightly less than natural bone (1.74 versus 1.8-2.1 g=cm 3 ) in ambient temperatures [1]. The major disadvantage of using Mg is its high corrosion rate in the body where it rapidly degrades; this limits its biocompatible applications [35][36][37][38]. If the corrosion rate can be controlled, Mg can be a good material for metallic implants because it presents a moderate elastic modulus of 45 GPa that is similar to cortical bone and can help avoid stress-shielding effect [1].…”

Section: Magnesium-based Resorbable Metalsmentioning

confidence: 99%

Metals for bone implants: safety, design, and efficacy

et al. 2016

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Like most bone deficits, mandibular segmental defects may result from surgical reconstruction due to congenital deformity, tumor resection, other pathologies, senescence, trauma, or infection. The goals of mandibular reconstruction are to restore the mandible's function and normal appearance. Clinical methods to restore the mandible typically rely on bone replacement using some combination of bone tissue transfer and metal implants. This paper reviews the safety, design, and efficacy of metal implants in general and specifically for the repair of mandibular segmental defects. These problems include implant incorporation, implant failure mechanisms (e.g., stress concentration, stress shielding), corrosion and toxicity, infection, and muscle re-attachment. Finally, this paper presents the use of porous nickel-titanium (NiTi) implants for the repair of skeletal defects through the example of mandibular segmental defects. Resorbable magnesium, and porous and non-porous NiTi, immobilization hardware are also discussed. These materials provide new options which may better match the material properties, and if they can be 3D printed, better match the shape of surrounding host tissue. These advances might reduce engrafted bone and metal implant failure and restore musculoskeletal function for the long term. Patient-specific hardware and grafting strategies might prove to be useful tools in determining both the patient's appearance and functional outcome following reconstructive musculoskeletal surgery.

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Current-induced depairing in theBi2Te3/FeTeinterfacial superconductor

Cited by 19 publications

References 23 publications

Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures

Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures

Current driven vortex-antivortex pair breaking and vortex explosion in the Bi2Te3/FeTe interfacial superconductor

Metals for bone implants: safety, design, and efficacy

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