Mössbauer spectroscopy of CuO and its relevance to high-temperature superconductors
M. G. Smith, R. D. Taylor, M. P. Pasternak, H. Oesterreicher
DOI 10.1103/PhysRevB.42.2188 · Physical Review B
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Abstract
Mössbauer emission spectroscopy and magnetic susceptibility studies were performed on doped57 antiferromagnetic CuO. Magnetic susceptibility data show that antiferromagnetic ordering occurs at TN=225 K and that the Co dopant (10–100 ppm) does not influence the bulk magnetic properties of CuO. Mössbauer spectra recorded at T>244 K show a dominant quadrupole-split site and two minor impurity sites. At T=244 K, a line broadening of the dominant site is observed indicating the onset of local magnetic order. The hyperfine interaction parameters at T<TN were determined. In particular, the sign and the asymmetry parameter η of the electric-field gradient (Vzz) and the angle θ formed by Vzz and magnetic hyperfine field were derived. We find η to be very small (η≤0.09) and 21°≤θ≤28°. The value of θ is in accord with neutron-diffraction results. The Fe57 Mössbauer spectroscopy of CuO is discussed in relation to other copper oxides and Fe containing perovskites.
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