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Polarized neutron scattering study of the multiple order parameter system NdB$$_4$$

Metoki, Naoto  ; Yamauchi, Hiroki; Matsuda, Masaaki*; Fernandez-Baca, J. A.*; Watanuki, Ryuta*; Hagiwara, Masato*

Neutron polarization analysis has been carried out in order to clarify the magnetic structure of multiple order parameter $$f$$-electron system NdB$$_4$$. We confirmed the non-collinear "all-in all-out" structure ($$Gamma$$$$_{4}$$) of the in-plane moment. We found that the magnetic moment along the $$c$$-axis $$m_c$$ showed diagonally antiferromagnetic structure ($$Gamma_{10}$$). The unusual magnetic ordering is phenomenologically understood via Landau theory. We also found that a long-period incommensurate modulation of the ($$0,0,1/2$$) antiferromagnetic structure of $$m_c$$ with the propagation $$q_{s1}$$ = (0.14, 0.14, 0.1) and $$q_{s2}$$ = (0.2, 0, 0.1) in phase III and IV, respectively. It is clear that the multipole degree-of-freedom based on pseudo-quartet $$f$$-electron state play important role.

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Category:Materials Science, Multidisciplinary

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