Semiconducting behaviour in the Remeika phase: Pr3Ir4Ge13

Ramesh Kumar Kamadurai, Michael O. Ogunbunmi, Harikrishnan S. Nair, André M. Strydom

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We report the magnetic, electronic and transport properties of the quasi-skutterudite compound Pr3Ir4Ge13 by means of magnetic susceptibility χ(T), electrical resistivity ρ(T), specific heat Cp(T), thermal conductivity κ(T), thermoelectric power S(T) and Hall coefficient RH(T) measurements. Pr3Ir4Ge13 does not show any phase transition down to 1.9 K. Magnetic, and specific measurements show that the system possesses a crystal electric field singlet ground state that is separated from the first excited state by about 37 K. ρ(T) shows a negative temperature coefficient of resistance for the whole temperature range studied and which can be explained in terms of Mott's impurity band conduction mechanism. RH(T) measurements show that Pr3Ir4Ge13 is a low-carrier density semiconductor and its transport properties indicate a metallic-non metallic cross over behaviour. Large Seebeck coefficient was observed for the entire temperature range of investigation, and the analysis of temperature variation of S and S∕T showed no sign of strong correlation between the Pr 4f2 and conduction electron states near Fermi level.

Original languageEnglish
Article number159481
JournalJournal of Alloys and Compounds
Volume872
DOIs
Publication statusPublished - 15 Aug 2021

Keywords

  • 71.20.Lp
  • 72.15.Eb
  • 72.15.Jf
  • 74.25.Fy
  • 75.20.En
  • Hall effect
  • Rare-earth intermetallics
  • Remeika Phase
  • Specific heat
  • Thermoelectric power

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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