Superconductivity in Sn films on InSb() taking account of the film morphology and structure

H–T phase diagram and the nature of vortex-glass phase in a quasi-two-dimensional superconductor: Sn-metal layer sandwiched between graphene sheets

“…The coherence length ξ(0) can be estimated as 420±20 Å using a relation H c2 (0) = Φ 0 /(2πξ(0) 2 ), where Φ 0 (= 2.0678×10 −7 Gauss cm 2 ) is a fluxoid. Note that our value of H c2 (0) for Sn-MG is on the same order as that of Sn films grown on an InSb (110) surface [19]. The value of H c2 (0) strongly depends on the thickness t of the Sn films: H c2 (0) = 3160 Oe for t = 420 Å and 2540 Oe for t = 2540 Å for H parallel to the Sn film.…”

“…Note that our value of H c2 (0) for Sn-MG is on the same order as that of Sn films grown on an InSb (110) surface [19]. The value of H c2 (0) strongly depends on the thickness t of the Sn films: H c2 (0) = 3160 Oe for t = 420Å and 2540 Oe for t = 2540Å for H parallel to the Sn film.…”

Role of a capping layer on the crystalline structure of Sn thin films grown at cryogenic temperatures on InSb substrates

“…α-Sn contains multiple topological insulator and semimetal phases that appear for different thicknesses 2 , levels of strain 4 and doping levels 5,6 . Another phase of Sn, tetragonal β -Sn is a superconducting metal 7 . Devices made of β -Sn/InSb structures exhibit properties such as hard induced gap and parity stability which is attractive for the investigation of topological superconductors, as well as for hybrid superconductor-semiconductor devices for quantum information processing 3 .…”

Epitaxially Driven Phase Selectivity of Sn in Hybrid Quantum Nanowires

“…Tin is a common group IV element used in a broad range of industrial applications including electronic circuits, optoelectronic devices, energy storage devices, and coating for commercial products. − Recently, interest was further triggered with the promise of exploring exotic topological phases with Sn–semiconductor hybrids. − However, the type of topology depends on which of the two major allotropes (α-Sn or β-Sn) is present. Hybridizing the semimetallic, cubic α-Sn phase, ,− , with semiconductors such as InSb (111) or (100) induces lattice mismatch-related strain fields. The resulting broken cubic symmetry can lead to topological insulator behavior. ,,,− Conversely, metallic β-Sn is a comparatively dense body-centered tetragonal structure and exhibits superconductivity with a bulk critical temperature of 3.7 K. ,− , Hence, hybrids of β-Sn and one-dimensional semiconductors with strong spin–orbit interaction, such as InSb or InAs, may exhibit topological superconductivity in the presence of magnetic fields. − …”

“…Hybridizing the semimetallic, cubic α-Sn phase, ,− , with semiconductors such as InSb (111) or (100) induces lattice mismatch-related strain fields. The resulting broken cubic symmetry can lead to topological insulator behavior. ,,,− Conversely, metallic β-Sn is a comparatively dense body-centered tetragonal structure and exhibits superconductivity with a bulk critical temperature of 3.7 K. ,− , Hence, hybrids of β-Sn and one-dimensional semiconductors with strong spin–orbit interaction, such as InSb or InAs, may exhibit topological superconductivity in the presence of magnetic fields. − …”