Abstract
Since the ferromagnetic intralayer exchange interaction in K 2 CuF 4 is due to the antiferrodistortive (AFD) orbital ordering of the 3d holes of Cu 2+ ions, we expect that the ferromagnetism of this compound to disappear when the AFD order of the distortion of CuF 6 octahedra collapses. Recent magnetic susceptibility measurements performed at high pressures on this compound actually confirmed the disappearance of the ferromagnetism above approximately 9 GPa [M. Ishizuka et al. : J. Phys. Soc. Jpn. 65 (1996) 1927]. To obtain evidence of the pressure-induced structural change which corresponds to the magnetic change mentioned above, we measured the pressure dependence of the phonon-Raman spectra of this compound. As a result, we found that the scattering lines relevant to the vibrational modes of CuF 6 octahedra ordered in the AFD fashion disappeared above 9∼10 GPa. This result is consistent with the structure above 9 GPa revealed by recent X-ray diffraction experiments that we performed.
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