Magnetocaloric effect in the Sm0.55Sr0.45MnO3 manganite

Autor: L. I. Koroleva, A. S. Morozov, Yu. V. Dolzhenkova, D. M. Zashchirinskii
Rok vydání: 2011
Předmět:
Zdroj: Physics of the Solid State. 53:316-319
ISSN: 1090-6460
1063-7834
DOI: 10.1134/s1063783411020363
Popis: The magnetocaloric effect ΔT has been studied by a direct method in two samples of the manganite Sm0.55Sr0.45MnO3, namely, a single crystal (sample A) and a ceramic sample (sample C). The temperature dependences of the ΔT effect of both samples exhibit a maximum at T max = 143.3 K for the sample A and T max = 143 K for the sample C. In these maxima, the values of the ΔT effect are 0.8 and 0.4 K in the magnetic field H = 14.2 kOe for the samples A and C, respectively. In addition, the ΔT(T) curve of the sample A has a minimum at T min = 120 K, in which ΔT = −0.1 K. The maximum value of the ΔT effect increases with an increase in the magnetic field H in the range of magnetic fields up to 14.2 kOe, and the rate of this increase at H > 8 kOe is higher than that at H < 8 kOe. These features of the ΔT effect are explained by the presence of ferromagnetic and antiferromagnetic A- and CE-type clusters in the samples.
Databáze: OpenAIRE
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