The role of Coulomb interaction in superconducting NbTiN thin films

Abstract

We report on the superconducting properties of Nb${}_{1-x}$Ti${}_x$N thin films of thickness $\sim$ 10 nm, with different Ti fraction $x$ in the range $0\le x\le 0.5$, deposited by high temperature chemical vapor deposition. In this parameter range, we observe that the superconducting critical temperature ($T_c$) increases with $x$. Our analysis, in accordance with both McMillan's and Finkelstein's theories, shows that disorder-enhanced Coulomb interaction decreases with $x$, leading to an increase of $T_c$.

6 pages, 5 figures

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Cited by in corpus (8)

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• Nano-bridge Superconducting Quantum Interference Devices: beyond the Josephson limit
• Evidence for current suppression in superconductor-superconductor bilayers
• Superconducting Diode Effect in Gradiently Strained Nb0.5Ti0.5N Films
• Superconducting phase transitions in disordered NbTiN films
• Superconducting properties of thin film $\mathrm{N}{\mathrm{b}}_{1-\mathrm{x}}\mathrm{T}{\mathrm{i}}_{\mathrm{x}}\mathrm{N}$ studied via the NMR of implanted ${}^8$Li
• Quantum critical scaling of the conductivity tensor at the metal-insulator transition in Nb${}_{1-x}$Ti${}_x$N
• Magnetoconductance and photoresponse properties of disordered NbTiN films