Sam. Mentink et al., DIRECT EVIDENCE FOR CRITICAL EXCHANGE COUPLING VIA AL LAYERS IN THE HEAVY-FERMION COMPOUND CEPD2AL3, Physical review. B, Condensed matter, 49(22), 1994, pp. 15759-15763
The long-range planar-type antiferromagnetic ordering in the heavy-fer
mion compound CePd2Al3 is shown to critically depend on the exact occu
pation and distribution of aluminum atoms over their available lattice
sites. A polycrystalline sample (T(N) = 2.7 K) is systematically comp
ared with a nonordering single crystal, by means of susceptibility, sp
ecific heat and site-specific Al-NQR/NMR experiments. Implications for
other Al-containing heavy-fermion systems are discussed.