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Electrical transport and magnetic ordering in R 2Ti3Ge4 (R=Dy, Ho and Er) compounds

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Abstract

New R 2Ti3Ge4 (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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Authors and Affiliations

  1. Department of Physics, Indian Institute of Technology, 600 036, Chennai, India

    R Nirmala, V Sankaranarayanan & K Sethupathi

  2. Chemical Faculty, Moscow Lomonosov State University, Moscow, Russia

    AV Morozkin

  3. Material Sciences Division, Indira Gandhi Centre for Atomic Research, 603 102, Kalpakkam, India

    T Geethakumary & Y Hariharan

Authors
  1. R Nirmala
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  2. V Sankaranarayanan
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  3. K Sethupathi
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  4. AV Morozkin
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  5. T Geethakumary
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  6. Y Hariharan
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Nirmala, R., Sankaranarayanan, V., Sethupathi, K. et al. Electrical transport and magnetic ordering in R 2Ti3Ge4 (R=Dy, Ho and Er) compounds. Pramana - J Phys 58, 1101–1104 (2002). https://doi.org/10.1007/s12043-002-0225-y

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  • DOI: https://doi.org/10.1007/s12043-002-0225-y

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