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High-magnetic-field studies of HgSe(Fe)

In the ternary semimagnetic compound Hg1-xFexSe some of the Hg ions are statistically substituted by Fe ions. The most interesting features of this material are related to the donor properties of the Fe ion, whose energy level lies about 210 meV above the band edge degenerate with the quasi-free conduction band states for sufficiently large x>or=0.0003 the Fermi energy gets pinned to the donor level. In this mixed-valence regime a multitude of interesting phenomena are observed: pronounced reduction of the microscopic scattering rate as expressed in the mobility and Dingle temperature, fluctuations between delocalized and localized states giving rise to a three-dimensional analogue of the quantum Hall effect, and spin fluctuations. These effects are demonstrated in data from numerous magnetospectroscopy experiments (transport, magnetization, IR and FIR spectroscopy) in DC magnetic fields up to 18 T and pulsed fields up to 100 T. The magneto-optical spectra are characteristically structured by nonlocal interaction between electromagnetic radiation and charge carriers. Different theoretical approaches ranging from an effective Wigner condensation over short-range correlation are discussed in relation to the experimental data. Due to the pronounced reduction of scattering, HgSe(Fe) proves to be an ideal matrix to study the semimagnetic behaviour of different paramagnetic substitutes as in the quaternary compound Hg1-x-yFexMnySe. Particular attention is given to possible quasi two-dimensional modifications of the compounds in heterostructures and superlattices.