Abstract
We obtained crystals of RuS2 doped with 57Fe from a Bi melt and determined the EPR hyperfine structure corresponding to 57Fe3+ in low-spin configuration. In crystals that were doped with both Fe and Cr an increase of the Fe3+ resonance and a simultaneous decrease of the Cr3+ resonance occurred by IR irradiation and revealed the same wavelength dependence. Compared with as-grown crystals the iron-doped crystals turned out to have a rather high electrical resistivity of about 104Omega cm at room temperature. For these iron-doped crystals two different activation energies of 0.04 eV and 0.35 eV of the free charge carriers (electrons) were determined from measurements of the electrical conductivity in the range of 94 K and 294 K.
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