The de Haas–van Alphen effect in the itinerant antiferromagnet FeGe2: manifestation of spin splitting
G.E. Grechnev, A.A. Lyogenkaya, V.B. Pluzhnikov, I.V. Svechkarev, A.V. Fedorchenko
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Department of Physics, University of Toronto, 60 George Str., Toronto M5S1A7, Canada pos Анотація:
Received December 27, 2013
The de Haas–van Alphen (dHvA) effect in the antiferromagnetic FeGe2 compound is studied experimentally. A sharp suppression of amplitude for the first harmonic of the dHvA oscillations is observed for a number of orbits on the Fermi surface of FeGe2. It is found that the conditions of the dHvA amplitude sup-pression (“spin-splitting zero”) are changed for FeGe2 doped with cobalt. To analyse the experimental data we proposed a method of comprehensive calculation of conduction electron g-factors in itinerant antiferro-magnetic systems, which is based on the calculations of spin-polarized electronic structure, taking into ac-count the spin-orbit interaction, and estimated the factor of exchange enhancement of spin paramagnetism in FeGe2.
PACS: 71.18.+y Fermi surface: calculations and measurements; effective mass, g-factor; PACS: 71.15.Mb Density functional theory, local density approximation, gradient and other corrections; PACS: 71.20.Lp Intermetallic compounds; PACS: 75.50.−y Studies of specific magnetic materials.
Key words: FeGe2, de Haas–van Alphen effect, g-factor, band antiferromagnetic.