Polycrystalline samples of Bi(0.5-y)La(y)Sr(0.5)MnO(3) (0.0≤y≤0.4) (BLSMO) have been synthesized to investigate the Bi(3+) lone-pair effect on the long-range charge-ordering (CO) state. Since the ionic size of La(3+) is similar to that of Bi(3+) and the Mn valence state does not change with La doping, we obtained the Bi lone-pair effect on the CO state without disturbance by other effects. The resistivity ρ(T) and thermoelectric power S(T) of BLSMO have been measured. A hysteretic behaviour was observed in both ρ(T) and S(T) for y = 0.1 and 0.2. From the onset of the hysteretic behaviour, we defined a charge-ordering temperature (T(CO)) and compared it to that of Bi(1-x)Sr(x)MnO(3) (BSMO). Finally, we found that the Bi(3+) lone pairs play an important role in the anomalously high T(CO) in BSMO.
The relation between the thermoelectric power
(S) and magnetic
susceptibility (χ) for Bi1−xSrxMnO3
(0.5≤x≤0.8)
has been established empirically. A simple linear equation for the relation between the two transport
coefficients is deduced from the experimental data. From this relation, we extract the Peltier heat
and S
for this material. They are composed of two terms: one has a magnetic origin
and the other originates from the configuration entropy. The universality
of this relation is found by applying the relation to other magnetically
interacting systems including colossal magnetoresistance materials and high
TC
cuprate.
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