Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Heusler compounds, semimetals and oxides (joint session MA/TT)
MA 5.13: Vortrag
Montag, 12. März 2018, 12:45–13:00, EB 301
Multicritical Lifshitz transition of the Fermi-surface in Sr3Ru2O7 — •Joseph Betouras1, Dmitry Efremov1,2, Alex Shtyk3, Andreas Rost4, Claudio Chamon5, and Andrew Mackenzie4,6 — 1Department of Physics, Loughborough University, Loughborough, UK — 2Leibniz-Institut fur Festkorper- und Werkstoffforschung, D-01069 Dresden, Germany — 3Department of Physics, Harvard University, Cambridge, MA 02138, USA — 4SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K. — 5Department of Physics, Boston University, Boston, MA, 02215, USA — 6Max Planck Institute for Chemical Physics of Solids, Noethnitzer Str. 40, 01187 Dresden, Germany
We present a theoretical framework, supported by experimental evidence for a Lifshitz topological transition of the Fermi surface in the
ultra-clean layered perovskite metal Sr3Ru2O7 1. Strong power-law dependence of the density of states on energy, associated to the topological transition, in addition to other main features of the Fermi surface as well as interactions, can lead to novel physics. As a consequence, many yet unexplained properties of the thermodynamics and formation of phases of this material can be understood. In particular, we naturally explain the increase of the entropy2 as well as the formation of spin density wave (phase A) 3. This work provides an example of the power of Fermi surface topological transitions.
1S. A. Grigera, S. A. et al. Science 306, 1154 (2004).
2 A. Rost et al., Science 325, 1360 (2009).
3 C. Lester et al, Nature Materials 14, 373 (2014).