First-principles calculation of the electron-phonon coupling in ultrathin Pb superconductors: Suppression of the transition temperature by surface phonons
- 21 June 2010
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 81 (21)
- https://doi.org/10.1103/physrevb.81.214519
Abstract
We present a first-principles calculation of the electron-phonon coupling for thin layered lead systems. Using our Wannier-Fourier approach we show that the superconductivity in these systems is accounted for by traditional isotropic Migdal-Eliasberg theory through phonon-induced electron pairing. It is found that the transition temperature of Pb is suppressed by the presence of surface phonons which have been stiffened by an increased electronic spring constant. Superconductivity persists in ultrathin layered Pb despite the suppression from a decreased electronic density of states and weakened coupling to surface phonons.Keywords
This publication has 32 references indexed in Scilit:
- Superconductivity in one-atomic-layer metal films grown on Si(111)Nature Physics, 2010
- Superconductivity at the Two-Dimensional LimitScience, 2009
- Tuning the Quantum Stability and Superconductivity of Ultrathin Metal AlloysScience, 2007
- Persistent Superconductivity in Ultrathin Pb Films: A Scanning Tunneling Spectroscopy StudyPhysical Review Letters, 2006
- Superconductivity Modulated by Quantum Size EffectsScience, 2004
- Theory of quantum size effects in thin Pb(111) filmsPhysical Review B, 2002
- Onset of superconductivity in the two-dimensional limitPhysical Review Letters, 1989
- Transition-Temperature Oscillations in Thin Superconducting FilmsPhysical Review Letters, 1984
- Destruction of Superconductivity in Disordered Near-Monolayer FilmsPhysical Review B, 1970
- Shape Resonances in Superconducting Thin FilmsPhysical Review Letters, 1963