Influence of magnetic heterogeneous state on magnetocaloric effect in Sm0.55Sr0.45MnO3статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Magnetocaloric effect (deltaT-effect) was studied by straight method in three samples of Sm0.55Sr0.45MnO3 manganite: ceramic (C) sample and two single crystals, annealed in oxygen (O) or in air atmosphere (A). The temperature dependence of deltaT-effect ofthe all samhles has maximum at Tmax equal to 143.3 K for A-sample, 244 K for O-sample and 143 K for C-sample. In these maxima deltaT-values are 0.8 K, o.41 K and 9.4 K for A-, O- and C-samples respectively. In addition the deltaT(T) curve of A-sample has minimum at Tmin = 120 K and deltaT-value in minimum equal to - 0.1 K. The maximum value of deltaT-effect increases with H up to the maximum field of measurement 14.2 kOe. At this takes place the rate of this increasing is more at H>8 kOe than at H<8 kOe. The above listed peculiarities of deltaT-effect are explained of presence in samples of ferromagnetic, antiferromagnetic A-type and antiferromagnetic CE-type clusters.