Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 100: Correlated Electrons: Other Materials
TT 100.8: Vortrag
Donnerstag, 19. März 2015, 17:00–17:15, H 3005
The influence of the phosphor z position on the Fermi surface of SrCo2P2: Experiment and theory. — •K. Götze1,2, J. Klotz1,2, C. Bergmann3, C. Geibel3, H. Rosner3, I. Kraft3, V. Lorenz4, and J. Wosnitza1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Institut für Festkörperphysik, TU Dresden, Germany — 3Max-Planck-Institut CPfS, Dresden, Germany — 4IFW, Dresden, Germany
The exact crystallographic and electronic structure plays an important role for the occurrence of quantum criticality, magnetic order, and superconductivity in the family of transition-metal pnictides AT2Pn2. The pnictide-distance z is a crucial parameter for the electronic structure because the distance between the T2Pn2 layers determines whether the tetragonal crystal structure is collapsed or uncollapsed and, thereby, whether pnictide bonds are formed or not.
We have investigated the influence of the P z position on the band structure of the strongly enhanced Pauli paramagnet SrCo2P2, a close relative to the superconducting iron arsenides, that is on the verge of magnetic order. The pronounced temperature dependence of the P z position influences the density of states (DOS) at the Fermi energy strongly. Therefore, we have investigated the Fermi surface of SrCo2P2 in the paramagnetic ground state with the de Haas-van Alphen effect. We compare our experimental results to band-structure calculations in order to determine the exact contribution of individual orbits to the DOS. We will also address the renormalization of the effective masses and the dimensionality of the Fermi surface.