Abstract
The paramagnetic ESR line width of Cu(HCOO)2·4H2O has been investigated in the temperature range 20°K to 273°K at 9 GHz and 36 GHz along the principal axes. An unusual linear temperature dependence is observed between 70°K and 273°K. Below 70°K a slight slope change occurs. The rapid line broadening nearT N shows evidence of weak ferromagnetism. The extrapolated 0°K paramagnetic line width shows strong exchange narrowing. An observed „sample size effect” is quantitatively explained. Various temperature-dependent line broadening mechanisms are considered. It is proposed that phonon modulation of the Moriya-Dzyaloshinsky interaction accounts for the linear process.
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