B. Lussier et al., INFLUENCE OF A MAGNETIC-FIELD ON THE ANTIFERROMAGNETIC ORDER IN UPT3, Physical review. B, Condensed matter, 54(10), 1996, pp. 6873-6876
A neutron-diffraction experiment was performed to investigate the effe
ct of a magnetic field on the antiferromagnetic order in the heavy-fer
mion superconductor UPt3. Our results show that a field in the basal p
lane of up to 3.2 T, higher than H-c2(0), has no effect: it can neithe
r select a domain nor rotate the moment. This has a direct impact on c
urrent theories for the superconducting phase diagram based on a coupl
ing to the magnetic order.