Evolution of magnetism from mixed-valent CeIr3B2 to trivalent CeIr3Si2

Umarji, A. M. ; Dhar, S. K. ; Malik, S. K. ; Vijayaraghavan, R. (1987) Evolution of magnetism from mixed-valent CeIr3B2 to trivalent CeIr3Si2 Physical Review B, 36 (16). pp. 8929-8932. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v36/i16/p8929_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.36.8929


The ternary compound CeIr3B2 is a mixed-valent material crystallizing in a monoclinic structure, closely related to the hexagonal CeCo3B2-type structure. The structural and magnetic phase diagrams of the systems CeRh3-yIryB2 (y=0-2) and CeIr3B2-xSix (x=0-2) have been investigated. Properties of the new compound CeIr3Si2 have been reported for the first time. It is shown that the structure of CeIr3B2 transforms to the hexagonal type on substitution of Rh and Si at Ir and B sites, respectively. Accompanying the structural transformation is an electronic transition in which the mixed-valent Ce atoms become more magnetic. The observed ferromagnetic ground state is similar to the one seen in CeRh3B2 (Tc=115 K and μsat=0.4μB). The role of Ce-atom ligands and their hybridization is thought to be the primary cause for the unusual nature of magnetism in CeT3B2-type compounds.

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