ИСТИНА

This work investigates planar Nb-Al-Nb Josephson junctions with submicron dimensions, where theintrinsic superconductivity of aluminum significantly enhances device performance. Wedemonstrate that the aluminumin terlayer substantially increases the critical current (Ic ≈ 50 μA) and characteristic voltage (Vc ≈ 1 mV) at T = 4 K, while preserving non-hysteretic current-voltage characteristics crucial for digital applications. Our theoretical framework, based on self-consistent solutions of the Usadel equations,shows that this performance improvement results from the synergistic combination of proximity-induced superconductivity and intrinsic pairing in aluminum, optimized atspecific boundary resistance values. Structural characterization reveal sepitaxial Nb/Al interfaceswith minimal interdiffusion, ensuring reproducible fabrication of compact junctions.The developed Nb-Al-Nb bridges represent promising components for high-density superconducting electroniccircuits operating at cryogenic temperatures.