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TT: Fachverband Tiefe Temperaturen

TT 14: Superconductivity: Non-Cuprate Non-Ferropnictide Superconductors

TT 14.6: Talk

Tuesday, March 24, 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).