Effect of substituting Fe and Ru for Ni on the thermopower of MgCNi3

C. Sulkowski, T. Klimczuk, R. J. Cava, K. Rogacki

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6 Scopus citations

Abstract

The intermetallic perovskite MgCNi3 is a superconductor with a Tc =7 K. Substitution of Fe and Ru for Ni decreases Tc monotonically as the doping concentration is increased. Here we report thermopower measurements S(T) on MgCNi3, MgCNi3-x Fex, and MgCNi3-x Rux. For MgCNi3 the thermopower is negative, -12.5 μV/K, at 300 K. The absolute value of S decreases as x increases in MgCNi3-x Fex and MgCNi3-x Rux. The sign of S changes from negative to positive at low temperatures for values of x>0.01. These data show that the carriers in MgCNi3 are electrons, and by increasing x and decreasing temperature, the participation of hole carriers clearly increases. The influence of the magnetic moments of the Fe atoms on the thermopower is not visible.

Original languageEnglish (US)
Article number060501
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number6
DOIs
StatePublished - Aug 1 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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