Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 50: Frontiers of Electronic Structure Theory: Focus on Artificial Intelligence Applied to Real Materials 2
O 50.11: Vortrag
Mittwoch, 7. September 2022, 17:30–17:45, S054
Electron-phonon drag in MgB2 — •Nakib Protik and Claudia Draxl — Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin, Germany
MgB2 is a well known phonon-mediated superconductor with a transition temperature around 40 K. The strong electron-phonon interactions present in the material also give rise to strong drag phenomena, as has been demonstrated experimentally in Refs. [1, 2]. While the measured thermopower in the normal phase shows hole-like transport, there is, however, no consensus regarding the sign and temperature dependence of the drag contribution. In this work, we carry out anisotropic and band-resolved ab initio transport calculations to investigate this puzzle. Our findings will shed light on the roles of the microscopic interactions on the strong drag behavior in metals.
[1] Schneider, Matthias, Dieter Lipp, Alexander Gladun, Peter Zahn, Axel Handstein, Günter Fuchs, Stefan-Ludwig Drechsler, Manuel Richter, Karl-Hartmut Müller, and Helge Rosner. "Heat and charge transport properties of MgB2." Physica C: Superconductivity 363, no. 1 (2001): 6-12.
[2] Putti, M., E. Galleani d’Agliano, D. Marre, F. Napoli, M. Tassisto, P. Manfrinetti, A. Palenzona, C. Rizzuto, and S. Massidda. "Electron transport properties of MgB2 in the normal state." The European Physical Journal B-Condensed Matter and Complex Systems 25, no. 4 (2002): 439-443.