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Phys. Rev. B 73, 193107 (2006) [4 pages]

Electronic properties of the metallic pyrochlore ruthenates Pb2Ru2O6.5 and Bi2Ru2O7

Makoto Tachibana,1,2 Yoshimitsu Kohama,2 Tomotaka Shimoyama,2 Akihiro Harada,2 Tomoyasu Taniyama,2 Mitsuru Itoh,2 Hitoshi Kawaji,2 and Tooru Atake2
1International Center for Young Scientists, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
2Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
Received 2 February 2006; published 22 May 2006

We report the temperature dependence of the resistivity, magnetic susceptibility, and heat capacity of single crystalline Pb2Ru2O6.5 and Bi2Ru2O7, the metallic members of the pyrochlore ruthenates. The analysis of the T2 coefficient of the resistivity, Pauli paramagnetic susceptibility, and linear heat-capacity coefficient indicates that Pb2Ru2O6.5 is a well-defined Fermi liquid with strong electron correlation. For Bi2Ru2O7, thermodynamic data suggest moderately correlated behavior, while the resistivity shows unusual behavior that can be attributed to the structural disorder in this compound. A comparison with the insulating pyrochlore ruthenates underlines the critical role of easily polarizable Pb/Bi ions in inducing the metallic properties and structural modifications observed in these compounds.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.73.193107
DOI: 10.1103/PhysRevB.73.193107
PACS: 74.70.Pq; 71.27.+a; 75.40.Cx; 72.15.-v
  • 74.70.Pq
    Ruthenates (superconducting materials)
  • 71.27.+a
    Strongly correlated electron systems; heavy fermions
  • 75.40.Cx
    Static properties of magnetic materials including order parameter, static susceptibility, heat capacities, critical exponents, etc
  • 72.15.-v
    Electronic conduction in metals and alloys
  • YEAR: 2006
KEYWORDS: lead compounds, bismuth compounds, electrical resistivity, magnetic susceptibility, specific heat, paramagnetic materials, Fermi liquid, electron correlations, crystal structure

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