Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 42: Superconductivity: Fabrication, Properties, Electronic Structure
TT 42.5: Talk
Thursday, March 29, 2012, 16:00–16:15, H 3005
A combined experimental and theoretical de Haas-van Alphen study on PrPt4Ge12 — V. Petzold1, •B. Bergk2,3, R. Gumeniuk1, O. Ignatchik2, A. Polyakov2, K. Götze2, A. Leithe-Jasper1, W. Schnelle1, M. Nicklas1, J. Wosnitza2, J. Grin1, and H. Rosner1 — 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany — 2Hochfeld-Magnetlabor Dresden – Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany — 3Technische Universität Dresden, Institute of Materials Science, D-01069 Dresden, Germany
The skutterudite PrPt4Ge12 superconducts at a surprisingly high temperature of Tc≈ 8 K [1]. Furthermore, a remarkably strong coupling [1], a gap function with point-like nodes [2], the exclusion of heavy fermions as an explanation [2], or the breaking of time-reversal symmetry [3] could not yet be arranged in a unified picture.
In this study, we combine band structure calculations and experiments to elucidate the electronic structure of PrPt4Ge12. We treat the strongly correlated 4f electrons of Pr in various approximations. Their reliability is tested by comparing with de Haas-van Alphen (dHvA) measurements on PrPt4Ge12 single crystals.
With the dHvA data-based strategy, introduced in
[4], we estimate which parts of the complex
Fermi surface are affected by the strong coupling established in the literature [1] .
Gumeniuk et al., PRL 100 (2008) 017002,
Maisuradze et al., PRL 103 (2009) 147002,
Maisuradze et al., PRB 82 (2010) 024524,
Bergk et al., PRL 100 (2008) 257004