Abstract
A magnetic phase transition of CoI 2 was studied by means of neutron diffraction of single crystals. A first-order magnetic transition was found at T N2 = 9.4 K in addition to the Néel temperature at T N1 = 11.0 K. The low-temperature ordered phase has a helical spin structure with an orthorhombic magnetic unit cell through the first-order magnetic transition. The observed successive magnetic transition may be related to the spin frustration in the c-plane.
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