Electrical transport and magnetic ordering in R
2Ti3Ge4 (R=Dy, Ho and Er) compounds |
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Authors: | R Nirmala V Sankaranarayanan K Sethupathi AV Morozkin T Geethakumary Y Hariharan |
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Institution: | (1) Department of Physics, Indian Institute of Technology, 600 036 Chennai, India;(2) Chemical Faculty, Moscow Lomonosov State University, Moscow, Russia;(3) Material Sciences Division, Indira Gandhi Centre for Atomic Research, 603 102 Kalpakkam, India |
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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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Keywords: | Intermetallic compounds magnetic ordering electrical resistivity thermoelectric power |
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