Abstract
The semiconducting ferromagnetic spinel compounds CdCr 2Se 4, CdCr 2S 4, HgCr 2Se 4 and CuCr 2Se 4 (metallic) were investigated by the perturbed angular correlations (PAC) method with the radioactive probes 111In, 111mCd, 111Ag, 117Cd, 199mHg and 77Br. The probes were implanted at the ISOLDE on-line separator (CERN-Geneva) into single crystals. From the time dependence of the PAC spectra and the measured hyperfine interaction parameters: electric field gradient and magnetic hyperfine field, the probe positions and the thermal behavior of the probes could be determined. Cd, Ag and Hg are substituted at the A-site, In at the A- and B-site in the semiconducting compounds and Br at the anion position. Electric and magnetic hyperfine fields were used as test quantities for theoretical charge and spin density distributions of LAPW calculations (WIEN97).
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