• T Geethakumary

      Articles written in Pramana – Journal of Physics

    • Electrical transport and magnetic ordering in R2Ti3Ge4 (R=Dy, Ho and Er) compounds

      R Nirmala V Sankaranarayanan K Sethupathi AV Morozkin T Geethakumary Y Hariharan

      More Details Abstract Fulltext PDF

      New R2Ti3Ge4 (R=Dy, Ho and Er) intermetallic compounds have been synthesized and characterized by X-ray diffraction and low temperature ac magnetic susceptibility, electrical resistivity and thermoelectric power measurements were carried out. The compounds crystallize in the parent, Sm5Ge4-type orthorhombic structure (space group Pnma) and lanthanide contraction is observed as one moves along the rare-earth series. The changeover from paramagnetic to antiferromagnetic phase happens at low temperatures and the ordering temperature scales with the de Gennes factor. The electrical resistivity is metallic with a negative curvature above 100 K. Thermopower displays a weak maximum at temperatures less than 50 K signifying the possible phonon and magnon drag effects.

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