Magnetic Study on Hexagonal Nitrides of 3d Transition Metals

抄録

Magnetic and Mössbauer effect measurements on the nitrides with hcp metal lattice of V, Cr, Mn and Fe are carried out as a function of composition. Hexagonal VN_x and hexagonal CrM_x are Pauli paramagnetic. Hexagonal MnN_x shows antiferromagnetism, while both hexagonal and orthorhombic FeN_x show ferromagnetism at low temperatures. In these Phases, nitrogen atoms suppress magnetic ordering in consequence of the reduction of magnetic moments. As a whole, the observed types of magnetism of hexagonal nitrides resemble those of their metals in spite of the difference in crystal structures. Type II superconductivity is found in hexagonal VN_x although it is not yet conclusive.