TY - JOUR
T1 - Anomalous transport behavior in geometrically frustrated system R2−xBixRu2O7 (R = rare earth, Y)
AU - Yoshii, Shunsuke
AU - Murata, K.
AU - Sato, M.
PY - 2001/1/1
Y1 - 2001/1/1
N2 - We have studied transport and magnetic properties of ruthenium pyrochlore oxides R2−xBixRu2O7 (R = rare earth, Y), which exhibit the Mott insulator to metal transition with increasing x. The spin-glass transition can be observed basically in the insulating x-region, which may be due to the freezing of Ru spins. Transport quantities, the electrical resistivity ρ, the Hall coefficient RH and the thermoelectric power S are found to be strongly affected by the spin-glass transition. Furthermore, near the metal-insulator phase boundary, RH increases rather rapidly with decreasing temperature and the Hall angle θH obeys the relation cot θH = a+bT2 in the paramagnetic state. These results suggest that there exist strong spin fluctuations in the metallic state of R2-xBixRu2O7, which is suppressed as the spin freezing proceeds.
AB - We have studied transport and magnetic properties of ruthenium pyrochlore oxides R2−xBixRu2O7 (R = rare earth, Y), which exhibit the Mott insulator to metal transition with increasing x. The spin-glass transition can be observed basically in the insulating x-region, which may be due to the freezing of Ru spins. Transport quantities, the electrical resistivity ρ, the Hall coefficient RH and the thermoelectric power S are found to be strongly affected by the spin-glass transition. Furthermore, near the metal-insulator phase boundary, RH increases rather rapidly with decreasing temperature and the Hall angle θH obeys the relation cot θH = a+bT2 in the paramagnetic state. These results suggest that there exist strong spin fluctuations in the metallic state of R2-xBixRu2O7, which is suppressed as the spin freezing proceeds.
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U2 - 10.1016/S0022-3697(00)00158-X
DO - 10.1016/S0022-3697(00)00158-X
M3 - Article
AN - SCOPUS:0034817508
VL - 62
SP - 331
EP - 336
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 1-2
ER -