Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Non-Cuprate Non-Ferropnictide Superconductors
TT 14.6: Vortrag
Dienstag, 24. März 2009, 11:15–11:30, HSZ 105
Superconducting properties of hydrogen under pressure — Pierluigi Cudazzo1, Gianni Profeta1, •Antonio Sanna2, Andrea Floris2, Alessandra Continenza1, Sandro Massidda3, and E.K.U. Gross2 — 1CNISM Dipartimento di Fisica, Universita’ degli studi dell’Aquila, L’Aquila Italy — 2Institut fuer Theoretishe Physik Freie Universitaet, Berlin — 3SLACS-INFM Dipartimento di Fisica Universita’ degli Studi di Cagliari, Cagliari Italy
We present first-principles calculations of the superconducting properties of molecular metallic hydrogen under pressure[1], obtained within the density functional theory of superconductivity [2]. Our study is able to single out the features which drive the system towards superconductivity: mainly, a rich and complex Fermi surface and strongly coupled phonon modes driving the intra- or intermolecular charge transfer. We predict three-gap superconductivity and a critical temperature that rises with increasing pressure up to 242 K at 450 GPa. Our study clearly demonstrates that a very high superconducting critical temperature can be reached purely from electron-phonon and Coulombic electron-electron interactions, thus confirming Ashcroft’s early speculations[3].
[1] P. Cudazzo et al., Phys. Rev. Lett 100, 257001 (2008).
M. Lüders et al., Phys. Rev. B 72, 024545 (2005).
M. A. L. Marques et al., Phys. Rev. B 72, 024546 (2005).
[2] L. N. Oliveira, E. K. U. Gross, and W. Kohn, Phys. Rev. Lett 60, 2430 (1988).
[3] N. Ashcroft, Phys. Rev. Lett. 21 1748 (1968).