AL-27 NUCLEAR-MAGNETIC-RESONANCE SPECTRA OF CE3AL11 AT LOW-TEMPERATURES

We have measured the Al-27 nuclear magnetic resonance, NMR, spectra or iented powder of the intermetallic compound Ce3Al11 at temperatures be tween 0.03 K and 20 K, and frequencies of 2.815 MHz, 3.925 MHz, 9.208 MHz and 74.81 MHz. In the paramagnetic state the NMR spectra show the quadrupolar-split contribution of the four inequivalent Al-sites with strongly temperature-dependent Knigth shifts. The NMR spectra indicate the onset of a ferromagnetic phase below 6.2 K transforming into a si nusoidally modulated antiferromagnetic state below 3.3 K.