2023/10/14 by A. S. Ilin, A. O. Strugova, Ilin, A. S. +17 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys
paper · pdf · doi:10.48550/arxiv.2310.09526
openalex publication_date 2023/10/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Superconductivity has been found in RuN films obtained by reactive magnetron sputtering. This is a novel member of the metal nitride superconductors family. The critical temperature of the superconducting transition varies depending on the substrate and ranges from 0.77 K to 1.29 K. The parameters of the crystal lattice of superconducting films have been determined: the lattice is distorted cubic with parameters a = b = c = 4.5586 Å, α=β=γ=87.96^∘. A zero temperature upper critical magnetic field Hc2(0) and the coherence length were found from the experimental data using WHH model. Hc2(0) = 2.3 T- 4.1 T for different substrates and exceeds the upper paramagnetic limit, as well as ξ= 12 nm. An s-wave single band energy gap Δ(0) = 0.19 meV was revealed by self-field critical current experiment at temperatures down to 10 mK, 2Δ/kTc =5.5 exceeding the BCS ratio 3.5.