New neutron scattering results on the spin dynamics in UNiAl and UPdAl

中性子散乱によるUNiAl and UPdAlのスピンダイナミクス研究における新しい知見

Scheneidewind, A.*; Hiess, A.*; Stockert, O.*; 阿曽 尚文*; 佐藤 憲昭*; Raymond, S.*; 金子 耕士   ; Blackburn, E.*; Steffens, P.*; Lander, G. H.*

Scheneidewind, A.*; Hiess, A.*; Stockert, O.*; Aso, Naofumi*; Sato, Noriaki*; Raymond, S.*; Kaneko, Koji; Blackburn, E.*; Steffens, P.*; Lander, G. H.*

Inelastic neutron scattering (INS) has been of particular importance in studying the interrelation of magnetism and superconductivity by determining the momentum- and energy-dependent microscopic spin dynamics in both the normal and superconducting state. In this context, we recently revisited the spin dynamics in the iso-structural magnetic superconductors UPdAl ( = 2K) and UNiAl ( = 1K). The magnetic order in UPdAl is commensurate with = (0, 0, 0.5), but incommensurate in UNiAl with = (0.39, 0, 0.5). We here present new INS results on the normal state spin dynamics of UNiAl in high resolution TAS mode as well as with the FlatCone set-up, and the influence of magnetic field on the spin dynamics in the superconducting state in UPdAl with a half-polarized setup.