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3 papers
Magnetism
Magnetocaloric effect in the Sm$_{0.55}$Sr$_{0.45}$MnO$_3$ manganite
D. M. Zashchirinskii,
L. I. Koroleva,
A. S. Morozov,
Yu. V. Dolzhenkova Lomonosov Moscow State University
Abstract:
The magnetocaloric effect
$\Delta T$ has been studied by a direct method in two samples of the manganite Sm
$_{0.55}$Sr
$_{0.45}$MnO
$_3$, namely, a single crystal (sample
$A$) and a ceramic sample (sample
$C$). The temperature dependences of the
$\Delta T$ effect of both samples exhibit a maximum at
$T_{\mathrm{max}}$ = 143.3 K for the sample
$A$ and
$T_{\mathrm{max}}$ = 143 K for the sample
$C$. In these maxima, the values of the
$\Delta T$ 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
$\Delta T(T)$ curve of the sample
$A$ has a minimum at
$T_{\mathrm{min}}$ = 120 K, in which
$\Delta T$ = -0.1 K. The maximum value of the
$\Delta T$ 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
$\Delta T$ effect are explained by the presence of ferromagnetic and antiferromagnetic
$A$- and CE-type clusters in the samples.
Received: 27.04.2010
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