Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: f-Electron Systems and Heavy Fermions
TT 38.4: Vortrag
Mittwoch, 3. April 2019, 10:30–10:45, H23
Spin-dependent Masses in High Magnetic Field: Minimal Model for CeCoIn5 — •Andrzej P. Kadzielawa1,2, Dominik Legut2, Maciej Fidrysiak1, and Józef Spałek1 — 1Insytut Fizyki, Uniwersytet Jagielloński, Kraków, Poland — 2IT4Innovations, Vysoká škola báňská - Technická univerzita Ostrava, Ostrava, Czech Republic
The intertwinement of superconductivity [1] and magnetism [2] in CeCoIn5 is an arduous problem, often approached by accurate but time-consuming methods like Dynamical Mean-Field Theory [3]. In contrast, we provide a minimal, two-dimensional (after [4]), model to understand the mechanism of spin-split masses in this heavy-fermion system. Using the band Hubbard U technique (DFT+U calculations), we retrieve the precise energy scale for the strong correlations. To account for this we use a minimal model of the Periodic Anderson Lattice solved using the so-called Statistically-consistent Gutzwiller Approximation. We obtain the proper, experimentally confirmed, qualitative behavior of the spin-dependent masses, as well as overall half-metallic nature of the heavy fermion behavior in this compound.
The work was supported by Grant MAESTRO No. DEC-2012/04/A/ST3/00342 from National Science Centre and Path to Exascale project No. CZ.02.1.01/0.0/0.0/16_013/0001791 by Min. of Edu. of Czechia.
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