ACTA

Crystal Structure and Magnetocaloric Effect of La_0.80Ag_0.15MnO₃ Nanoparticles

M. Zentková^a, M. Mihalik^a, M. Mihalik Jr.^a, M. Kovalik^a, M. Perovic^b, M. Vavra^c, J. Briančin^d
^aInstitute of Experimental Physics SAS, Watsonova 47, 04001 Košice, Slovakia
^bInstitute of Nuclear Sciences Vinca, University of Belgrade, 11001 Belgrade, Republic of Serbia
^cFaculty of Science,P.J. Šafárik University, Moyzesova 11, 04001 Košice, Slovakia
^dInstitute of Geotechnics SAS, Watsonova 45, 04001 Košice, Slovakia

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Annealing of non stoichiometric La_0.80Ag_0.15MnO₃ nanoparticles leads to the change of the crystal symmetry from Pnma to R̅3c and to almost doubling of its Curie temperature from 117 K to 317 K. This effect is due to the releasing of lattice distortions and strengthening of double exchange interaction. The large values of the magnetocaloric entropy of the order of ΔS=6.19 J/(kg K) were observedat Δμ₀H=5 T and T=315 K.

DOI:10.12693/APhysPolA.137.900
topics: manganites, nanoparticles, magnetic properties, magnetocaloric effect