Magnetism and structural chemistry of ternary silicides: (RE,Th, U)Pt2Si2 (RE = rare earth) |
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Authors: | K Hiebl P Rogl |
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Institution: | Institut für Physikalische Chemie, Universität Wien, A-1090 Vienna, Währingerstrasse 42, Austria |
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Abstract: | Ternary silicides (RE, U, Th)Pt2Si2 have been prepared from the elements. All the compounds (RE= Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and U, Th) were found to be isotypic and crystallize with the primitive tetragonal CePt2Si2-type structure closely related to the CaBe2Ge2-type. The magnetic properties of these alloys were studied in the temperature range 1.5 K < T < 1100 K and in fields up to 1.3 T revealing a typical Van Vleck paramagnetism of free RE3+-ions for temperatures T > 200 K. A nonmagnetic ground state is reflected from the magnetic susceptibility data of CePt2Si2, which are interpreted in terms of interconfiguration fluctuations (ICF). The magnetic results of SmPt2Si2 (μeff = 0.7 BM) compare well with the ideal Van Vleck behavior of Sm3+ ions with a ground state and a low-lying excited first level . At temperatures below 40 K antiferromagnetic ordering is found for (Gd, Tb, U)Pt2Si2; whereas in case of (Dy, Ho, Er, Tm)Pt2Si2 the onset of ferromagnetism is indicated below 4 K. None of the samples exhibited a superconducting transition above 1.8 K. |
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