Magnetic properties and structural data of ternary silicides: (RE,Th,U) Os2Si2 (RE= rare earth) |
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Authors: | K. Hiebl C. Horvath P. Rogl M.J. Sienko |
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Affiliation: | Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria;Baker Laboratory of Chemistry, Cornell University, Ithaca, N.Y. 14853, USA |
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Abstract: | New ternary silicides (RE,Th,U) Os2Si2 have been synthesized from the elements. All the compounds (RE= Y,La,Ce,Pr,Nd,Sm,Gd,Tb,Dy,Ho,Er,Tm,Yb, Lu) were found to be isotypic and to crystallize with the ordered BaAl4-type of structure (ThCr2Si2-type). Magnetic properties of these alloys — studied in the temperature range 1.53+ ions at temperatures higher than 300 K. The observed effective paramagnetic moment of CeOs2Si2, μ(eff)=0.98 BM, is compatible with a rather low concentration (15%) of Ce3+. The effective moment of SmOs2Si2, μ(eff)=0.47 BM, is in reasonable agreement with a Hund's rule ground level for free Sm3+. For temperatures above 25 K, the magnetic susceptibility as a function of temperature corresponds to the Van Vleck behavior for free Sm3+ (closely spaced multiplet, ,. Magnetic ordering temperatures of REOs2Si2 silicides are generally below 42 K. (Pr,Nd,Ho,Er,Tm) Os2Si2 exhibit ferromagnetic ordering whereas (Sm,Gd, Tb,Dy) Os2Si2 show antiferromagnetic behavior. Above 1.8 K none of the samples was found to be superconducting. |
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