Is the Magnetism of HgSe:Fe Clearly Understood?
K. Dybkoa, A. Łusakowskia, J. Kossuta, M. Arciszewskaa, P.J.E.M. vd Lindenb, A. Wittlinb, J.A.A.J. Perenboomb and A. Mycielskia
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
bHigh Field Magnet Laboratory, University of Nijmegen, Toernooiveld, Nijmegen, The Netherlands
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The high magnetic field magnetization measurements of low composition Hg1-xFexSe (0.0002 < x < 0.003) at temperatures ranging from 1.6 K to 40 K and in magnetic fields up to 20 T are reported. The magnetization in a sample containing only Fe3+ ions (x = 0.0002) is described by the Brillouin function (j = 5/2). The magnetization in the sample codoped with Ga, containing only Fe2+ is well described in the model of isolated Fe2+ ions. The latter model takes into account the tetrahedral crystal field, the spin-orbit interaction and the Zeeman term. On the other hand, the magnetization of sample with both Fe3+ and Fe2+ present simultaneously (x = 0.003) is shown to be different from a simple additive superposition of the contributions due to Fe3+ and Fe2+ subsystems. The possible origin of this discrepancy is discussed.
DOI: 10.12693/APhysPolA.87.193
PACS numbers: 75.20.Hr, 75.30.Hx