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Magnetic structure study of antiferromagnet NpPtGa$$_{5}$$ by neutron diffraction

Jonen, Shintaro; Metoki, Naoto   ; Yamamoto, Etsuji  ; Homma, Yoshiya*; Aoki, Dai*; Shiokawa, Yoshinobu*; Onuki, Yoshichika

The magnetic structure of NpPtGa$${rm_5}$$ was investigated by neutron diffraction. NpPtGa$${rm_5}$$ exhibits an A-type antiferromagnetic structure with propagation vector $$vec{q}$$ = (0 0 1/2) below $$T_{rm N}$$ = 26 K. The estimated Np magnetic moment is 0.38(5) $$mu_{rm B}$$, and it is oriented parallel to the $$langle$$100$$rangle$$ direction. This small moment would be consistent with the large $$gamma$$ = 123 mJ/(K$${rm^2}cdot$$mol), indicative of the heavy fermion nature. The field-induced anomaly in the magnetic susceptibility is clarified to be a signature for an antiferromagnetic domain change between multi-domains to single-domain states.

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Category:Chemistry, Physical

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