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Magnetism of R2Ti3Ge4 (R=Sc, Gd, Tb, Dy, Ho, and Er) compounds

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7 Author(s)
Nirmala, R. ; Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India ; Sankaranarayanan, V. ; Sethupathi, K. ; Rangarajan, G.
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Results of magnetization measurements down to 1.8 K on polycrystalline R2Ti3Ge4 (R=Sc, Gd, Tb, Dy, Ho, and Er) compounds of orthorhombic Sm5Ge4-type (space group Pnma) are presented and discussed. Gd2Ti3Ge4 is found to be a ferromagnet below 32 K while other R2Ti3Ge4 compounds, with magnetic rare earths (R=Tb, Dy, Ho, and Er), undergo a low temperature antiferromagnetic transition. The effective magnetic moment eff) values obtained from the Curie–Weiss paramagnetic susceptibility correspond to that of R3+ ions. Saturation of magnetization is not observed upto applied fields of 5.5 T at 1.8 K for all R2Ti3Ge4 compounds except Gd2Ti3Ge4, indicating the possible presence of crystal field effects. Electrical resistivity of these compounds is dominated by electron-phonon scattering above 20 K and signature of phonon and magnon drag effects are seen in the low temperature thermopower data. © 2004 American Institute of Physics.

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Journal of Applied Physics  (Volume:95 ,  Issue: 11 )