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Abstract:
An elastic neutron scattering study was performed on the new
superconducting heavy fermion systems UPd2Al3 and UNi2Al3. The neutron
diffraction patterns reveal unambiguously long range antiferromagnetic
order in UPd2Al3 with an ordered magnetic moment mu(U) = (0.85 +/- 0.03)
mu(B), which coexists with the superconducting state. This is by far the
largest mu(U) value observed for any heavy fermion superconductor. For
UNi2Al3, no long-range magnetic order could be observed for temperatures
T greater-than-or-equal-to 1.5 K, yielding an upper limit of the ordered
moment of 0.2-mu(B).