TY - JOUR
KW - Semiconductor materials
KW - Bismuth compounds
KW - Single crystals
KW - High temperature superconductors
KW - Superconducting materials
KW - Magnetic susceptibility
KW - Cationic substitution
AU - J.-M Tarascon
AU - Ramamoorthy Ramesh
AU - P Barboux
AU - M.S Hedge
AU - G.W Hull
AU - L.H Greene
AU - M Giroud
AU - Y LePage
AU - W.R McKinnon
AU - J.V Waszcak
AU - L.F Schneemeyer
AB - We report the cationic substitution of Cu by Co within the 85K Bi based high Tc oxides to produce new phases of general formula Bi2M3Co2Oy with M = Ca, Sr and Ba. Single crystals of these phases, grown using Co3O4 (excess) flux, were investigated for their structural, magnetic and electrical properties. The subcell appears similar to that of Bi2Sr2CaCu2Oy phase but the superstructure is more complicated due to the presence of a more complex incommensurate structural modulation. The substitution of Cu by Co is accompanied by an uptake of additional oxygen. With M = Sr or Ca, the compounds are semiconductors, whereas when M = Ba the compound is metallic above 100K, and semiconducting below 100K. The magnetic susceptibility varies little with temperature, and shows no magnetic transitions. Photoemission measurements show that Co is in a + 3 oxidation state with a low spin configuration. © 1989.
BT - Solid State Communications
DO - 10.1016/0038-1098(89)91813-9
LA - eng
M1 - 8
N1 - cited By 84
N2 - We report the cationic substitution of Cu by Co within the 85K Bi based high Tc oxides to produce new phases of general formula Bi2M3Co2Oy with M = Ca, Sr and Ba. Single crystals of these phases, grown using Co3O4 (excess) flux, were investigated for their structural, magnetic and electrical properties. The subcell appears similar to that of Bi2Sr2CaCu2Oy phase but the superstructure is more complicated due to the presence of a more complex incommensurate structural modulation. The substitution of Cu by Co is accompanied by an uptake of additional oxygen. With M = Sr or Ca, the compounds are semiconductors, whereas when M = Ba the compound is metallic above 100K, and semiconducting below 100K. The magnetic susceptibility varies little with temperature, and shows no magnetic transitions. Photoemission measurements show that Co is in a + 3 oxidation state with a low spin configuration. © 1989.
PY - 1989
SP - 663
EP - 668
T2 - Solid State Communications
TI - New non-superconducting layered Bi-oxide phases of formula Bi2M3Co2Oy containing Co instead of Cu
VL - 71
SN - 00381098
ER -