Abstract
FexCu1−xRh2Se4 is found to crystallize with a pure spinel structure in the composition range 0≤x≤0.3. Mössbauer spectra of FexCu1−xRh2Se4 have been taken at various temperatures ranging from 4.2 K to room temperature. Analysis of Mössbauer spectra at 4.2 K indicate that the effective hyperfine field increases with increasing iron concentration x and that the quadrupole splitting is negligible. The absence of quadrupole splitting above the magnetic ordering temperature TN indicates that iron ions occupy only the tetrahedral sites. The isomer shifts indicate that the charge states of the Fe ions have a ferric character. Magnetic susceptibility measurements by dc SQUID magnetometry show that long-range superexchange interactions on the tetrahedral sites are antiferromagnetic.
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