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\begin{document}
\title{Magnetocaloric Effect of Double Perovskite Manganite La0.8Ø0.6Ca1.6Mn2O7 having the Magnetostructural Transition}
\author{\underline{C.G. Ünlü}}
\affiliation{Department of Biomedical Engineering, Pamukkale University, Denizli Turkey}
\author{A. Tekgül}
\affiliation{ Department of Physics, Uludag University, Bursa, Turkey }
\author{M. Acet}
\affiliation{Faculty of Physics, Universität Duisburg-Essen, Duisburg, Germany}
\author{M. Farle}
\affiliation{Faculty of Physics, Universität Duisburg-Essen, Duisburg, Germany}
\begin{abstract}
The sintering of some perovskites was dominated by the diffusion of A-site cations during the densification, and A-site cation vacancies could assist the diffusion of A-site cations. Therefore, the porosities are created by this process. Furthermore, the magnetic properties and magnetocaloric effect of materials is controlling by porosity.
We present a new approach introducing porosity in the bilayered Ruddlesden-Popper Perovskites La$_{1.4}$Ca$_{1.6}$Mn$_{2}$O$_{7}$ perovskite manganite. Here, A-site deficient is created by the evaporation of K$^{1+}$ during the high temperature sintering and this evaporation supports the porosities of crystal structure of the material. It is shown that there is a structural transition associated with the ferromagnetic-paramagnetic transition. The results reveal that two phase transitions exist within the range from room temperature to 112 K: orthorhombic (O)-tetragonal (T)-rhombohedral (R).


\end{abstract}
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\end{document}
