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InN superconductivity is very special among III-V semiconductors, because other III-V semiconductor (like GaAs, GaN, InP, InAs etc.) usually lacks strong covalent bonding and seldom shows superconductivity at low-temperature. In this paper, via current-voltage(I-V) measurement, we probe the superconducting phase transitions in InN. The possible connection with those chemical-unstable phase separated inclusions, like metallic indium or In2O3, was removed by HCl acid etching. It finds InN samples can show different phase transition behaviors. The vortex-glass (VG) to liquid transition, which is typical in type-II superconductors, is observed in the sample with large InN grain size. In contrast, the small grain-sized samples superconducting properties are sensitive to acid etching, shows a transition into a non-zero resistance state at the limit of temperature approaches zero. Our work suggests that the grain size and inter-grain coupling may be two key factors for realizing InN superconductivity. InN superconductivity can become robust and chemical stable if the grain size and inter-grain coupling both are large enough.
Using typical experimental techniques it is difficult to separate the effects of carrier density and disorder on the superconducting transition in two dimensions. Using a simple fabrication procedure based on metal layer dewetting, we have produced g
Uncapped InN nanostructures undergo a deleterious natural aging process at ambient conditions by oxygen incorporation. The phases involved in this process and their localization is mapped by Transmission Electron Microscopy (TEM) related techniques.
We experimentally studied the Josephson supercurrent in Nb/InN-nanowire/Nb junctions. Large critical currents up to 5.7 $mu$A have been achieved, which proves the good coupling of the nanowire to the superconductor. The effect of a magnetic field per
The discovery of topological insulator phase has ignited massive research interests in novel quantum materials. Topological insulators with superconductivity further invigorate the importance of materials providing the platform to study the interplay
When magnetic atoms are inserted inside a superconductor, the superconducting order is locally depleted as a result of the antagonistic nature of magnetism and superconductivity1. Thereby, distinctive spectral features, known as Yu-Shiba-Rusinov stat