Giant Magnetothermopower in Sm0.55Sr0.45MnO3 Manganite,статья
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Аннотация:In this paper, we study the thermoelectric power α and influence on it of the magnetic
field (magnetothermopower Δα/α = (αH – αH=0)/αH=0) in the Sm0.55Sr0.45MnO3 manganite in a wide
temperature range. These samples contain clusters of three types: A-type antiferromagnetic clusters
with the Neel temperature TNA ≥ TC, CE-type antiferromagnetic clusters with the TNCE = 240 K, in
which there is a charge ordering, displacing oxygen ions and ferromagnetic clusters with the Curie
temperature TC = 126 K. The temperature dependence graph of α(T) have a wide maximum
including TC and TNCE and the sharp minimum in the{Δα/α}(T) curves in the TC-region. Negative
magnetothermopower in minimum achieves the giant value ~ 85% in magnetic field 14.17 kOe. It is
shown that thermopower is largely caused by the presence of ferromagnetic nanoclusters of ferrontype
and to a smaller degree of CE-type antiferromagnetic clusters.