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Magnetic structure and successive phase transition in NpRhGa$$_{5}$$

Jonen, Shintaro; Metoki, Naoto  ; Honda, Fuminori; Kaneko, Koji  ; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji ; Haga, Yoshinori ; Shiokawa, Yoshinobu; Onuki, Yoshichika

The magnetic structure of NpRhGa$$_5$$ has been investigated by neutron scattering. NpRhGa$$_5$$ exhibits two antiferromagnetic phases with transition temperatures at T$$_{N1}$$ = 36 K and T$$_{N2}$$ = 33 K. Neutron scattering experiments revealed an antiferromagnetic structure with propagation vector q = (0 0 1/2) for both, where the Np magnetic moments are oriented parallel to the c-axis for T$$_{N2}$$ $$<$$ T $$<$$ T$$_{N1}$$ and parallel to the [110] direction on basal plane for T $$<$$ T$$_{N2}$$. At T$$_{N2}$$ the reorientation of magnetic moments is accompanied by a sudden increase of magnetic moments, indicative of the first order transition. The magnetic form factor revealed a dominant contribution of the orbital moments.



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Category:Physics, Condensed Matter



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