Robust paramagnetism in Bi2-xMxRu2O7 (M=Mn,Fe,Co,Ni,Cu) pyrochlore

M. K. Haas, Robert Joseph Cava, M. Avdeev, J. D. Jorgensen

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Abstract

We report magnetic susceptibility, resistivity, and Seebeck coefficients for Bi2-xMxRu2O7 pyrochlore. The solid solution exists up to x=0.5 for M=Cu,Ni,Co and up to x=0.1 O.1 for M=Fe,Mn. The doped materials do not exhibit ferromagnetism or any localized ruthenium moment behavior. Instead we find the Ru-O and Bi-O sublattices to be essentially independent, with any magnetism resulting from the unpaired first-row transition metal dopant spins. Cobalt substitution for bismuth results in localized Co2+ and low-temperature spin-glass transitions in several cases. Nickel moments on the pyrochlore lattice display properties intermediate to localized and itinerant. Finally, copper doping results in an enhancement of the Pauli metallic density of states.

Original languageEnglish (US)
Article number094429
Pages (from-to)944291-944297
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number9
StatePublished - Sep 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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