Neutron scattering study on NdB

Metoki, Naoto   ; Yamauchi, Hiroki   ; Matsuda, Masaaki*; Fernandez Baca, J.*; Yoshida, Masahiro*; Yoshizawa, Hideki*; Hagihara, Masato*   ; Watanuki, Ryuta*

We report the magnetic structures and propose the mechanism of the successive transition based on the -electron state revealed by CEF excitation. We confirmed the non-collinear `all-in all-out' structure () of the in-plane moment. We found that the magnetic moment along the -axis showed diagonally antiferromagnetic structure (). The unusual magnetic ordering is phenomenologically understood via Landau theory. We also found that a long-period incommensurate modulation of the () antiferromagnetic structure of with the propagation = (0.14, 0.14, 0.1) and = (0.2, 0, 0.1) in phase III and IV, respectively. We found pseudo-quartet -electron state based on and . We can propose the intermediated phase as the magnetically ordered phase of while and coupling phase tabilized in low temperatures.