Robust paramagnetism in Bi{sub 2-x}M{sub x}Ru{sub 2}O{sub 7} (M = Mn,Fe,Co,Ni,Cu) pyrochlore.
We report magnetic susceptibility, resistivity, and Seebeck coefficients for Bi{sub 2-x}M{sub x}Ru{sub 2}O{sub 7} pyrochlore. The solid solution exists up to x=0.5 for M=Cu,Ni,Co and up to x=0.1 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 Co{sup 2+} 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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949688
- Report Number(s):
- ANL/MSD/JA-43313
- Journal Information:
- Phys. Rev.B, Journal Name: Phys. Rev.B Journal Issue: Sep. 1, 2002 Vol. 66; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Pyrochlore phases in Bi/sub 2-x/M/sub x/Ru/sub 2-y/Ir/sub y/O/sub 7-z/ (M = Mg, Ca, Sr, Co, Cu) systems
Similarities and differences in the structural and electronic properties of ruthenium and iridium pyrochlores A{sub 2}M{sub 2}O{sub 7{minus}y} (M = Ru, Ir)
Crystal structure and electrical properties of the pyrochlore ruthenate Bi[sub 2-x]Y[sub x]Ru[sub 2]O[sub 7]
Journal Article
·
Fri Feb 28 23:00:00 EST 1986
· Mater. Res. Bull.; (United States)
·
OSTI ID:5048715
Similarities and differences in the structural and electronic properties of ruthenium and iridium pyrochlores A{sub 2}M{sub 2}O{sub 7{minus}y} (M = Ru, Ir)
Journal Article
·
Sat Feb 28 23:00:00 EST 1998
· Journal of Solid State Chemistry
·
OSTI ID:642173
Crystal structure and electrical properties of the pyrochlore ruthenate Bi[sub 2-x]Y[sub x]Ru[sub 2]O[sub 7]
Journal Article
·
Thu Dec 31 23:00:00 EST 1992
· Journal of Solid State Chemistry; (United States)
·
OSTI ID:7078615