Robust paramagnetism in (formula presented) (formula presented) Fe, Co, Ni, Cu) pyrochlore

M. K. Haas; R. J. Cava; M. Avdeev; J. D. Jorgensen

doi:10.1103/PhysRevB.66.094429

Robust paramagnetism in (formula presented) (formula presented) Fe, Co, Ni, Cu) pyrochlore

M. K. Haas, R. J. Cava, M. Avdeev, J. D. Jorgensen

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2 Scopus citations

Abstract

We report magnetic susceptibility, resistivity, and Seebeck coefficients for (formula presented) pyrochlore. The solid solution exists up to (formula presented) for (formula presented) Ni, Co and up to (formula presented) for (formula presented) 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 (formula presented) 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 language	English (US)
Pages (from-to)	1-7
Number of pages	7
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.66.094429
State	Published - 2002

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.66.094429

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title = "Robust paramagnetism in (formula presented) (formula presented) Fe, Co, Ni, Cu) pyrochlore",

abstract = "We report magnetic susceptibility, resistivity, and Seebeck coefficients for (formula presented) pyrochlore. The solid solution exists up to (formula presented) for (formula presented) Ni, Co and up to (formula presented) for (formula presented) 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 (formula presented) 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.",

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T1 - Robust paramagnetism in (formula presented) (formula presented) Fe, Co, Ni, Cu) pyrochlore

AU - Haas, M. K.

AU - Cava, R. J.

AU - Avdeev, M.

AU - Jorgensen, J. D.

PY - 2002

Y1 - 2002

N2 - We report magnetic susceptibility, resistivity, and Seebeck coefficients for (formula presented) pyrochlore. The solid solution exists up to (formula presented) for (formula presented) Ni, Co and up to (formula presented) for (formula presented) 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 (formula presented) 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.

AB - We report magnetic susceptibility, resistivity, and Seebeck coefficients for (formula presented) pyrochlore. The solid solution exists up to (formula presented) for (formula presented) Ni, Co and up to (formula presented) for (formula presented) 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 (formula presented) 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.

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Robust paramagnetism in (formula presented) (formula presented) Fe, Co, Ni, Cu) pyrochlore

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