Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.75: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Electronic structure of the B20 compound CrGe — •J. Klotz1,2, K. Götze1,2, J. Bruin3, C. Geibel4, K. Weber4, M. Schmidt4, H. Rosner4, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3High Magnetic Field Laboratory, Radboud University, Netherlands — 4Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
CrGe is a nonmagnetic transition-metal germanide with the B20 non-centrosymmetric cubic structure. In contrast, the isostructural MnGe and FeGe both show a helical spin order. We present dHvA-effect data on CrGe that were obtained employing capacitive torque magnetometers in a 18 T/30 mK and a 33 T/340 mK system. In combination with our fplo calculations, we provide a detailed picture of the Fermi-surface topology of CrGe. Furthermore, by comparing the calculated band structures of CrGe and MnGe, we discuss possible reasons for the absence of magnetic order in CrGe. Finally, our calculations indicate that substituting Ge by As or Sn will not lead to magnetic order.