Abstract
Moessbauer emission spectroscopy and magnetic susceptibility studies were performed on {sup 57}Co-doped antiferromagnetic CuO. Magnetic susceptibility data show that antiferromagnetic ordering occurs at {ital T}{sub {ital N}}=225 K and that the Co dopant (10--100 ppm) does not influence the bulk magnetic properties of CuO. Moessbauer spectra recorded at {ital T}{gt}244 K show a dominant quadrupole-split site and two minor impurity sites. At {ital T}=244 K, a line broadening of the dominant site is observed indicating the onset of local magnetic order. The hyperfine interaction parameters at {ital T}{lt}{ital T}{sub {ital N}} were determined. In particular, the sign and the asymmetry parameter {eta} of the electric-field gradient ({ital V}{sub {ital z}{ital z}}) and the angle {theta} formed by {ital V}{sub {ital z}{ital z}} and magnetic hyperfine field were derived. We find {eta} to be very small ({eta}{le}0.09) and 21{degree}{le}{theta}{le}28{degree}. The value of {theta} is in accord with neutron-diffraction results. The {sup 57}Fe Moessbauer spectroscopy of CuO is discussed in relation to other copper oxides and Fe containing perovskites.
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