Shubnikov–de Haas oscillations and electronic correlations in the layered organic metal к-(BETS)2 Mn[N(CN)2]3
M.V. Kartsovnik1, V.N. Zverev2,3, W. Biberacher1, S.V. Simonov3, I. Sheikin4, N.D. Kushch5, and E.B. Yagubskii5
1Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften 8 Walther-Meissner-Strasse, Garching D-85748, Germany
2Institute of Solid State Physics, Russian Academy of Sciences 2 Academician Ossipyan Str., Chernogolovka 142432, Russia
3Moscow Institute of Physics and Technology, 9 Institutskii per., Dolgoprudny 141700, Russia 4Laboratoire National des Champs Magnétiques Intenses, CNRS, INSA, UJF, UPS, 9 Grenoble Cedex F-38042, France
5Institute of Problems of Chemical Physics, Russian Academy of Sciences 1 ave. Academician Semenov, Chernogolovka 142432, Russia
Received August 11, 2016
We present magnetoresistance studies of the quasi-two-dimensional organic conductor к-(BETS)2 Mn[N(CN)2]3, where BETS stands for bis(ethylenedithio) tetraselenafulvalene. Under a moderate pressure of 1.4 kbar, required for stabilizing the metallic ground state, Shubnikov–de Haas oscillations, associated with a classical and a magnetic-breakdown cyclotron orbits on the cylindrical Fermi surface, have been found at fields above 10 T. The effective cyclotron masses evaluated from the temperature dependence of the oscillation amplitudes reveal strong renormalization due to many-body interactions. The analysis of the relative strength of the oscillations corresponding to the different orbits and of its dependence on magnetic field suggests an enhanced role of electron-electron interactions on flat parts of the Fermi surface.
PACS: 72.15.Gd Galvanomagnetic and other magnetotransport effects; PACS: 74.70.Kn Organic superconductors; PACS: 71.18.+y Fermi surface: calculations and measurements; effective mass, g-factor.