Abstract
The dielectric behavior of half doped manganites La0.5Ca0.5−xSrxMnO3 (0.1≤x≤0.4) with varying magnetic ground states has been studied. The real part of relative permittivity as a function of temperature ε′(T), exhibits a maximum around the ferromagnetic (TC) and charge ordering transition (TCO) temperatures accompanied with high dielectric losses. The activation energies obtained for x=0.1 and 0.3 samples below TCO are the same ∼0.12 eV, whereas the relaxation time constant varies in the range 2.8×10−9 s–6.03×10−11 s. In contrast to samples having x≤0.3, for x=0.4 doping, the dielectric permittivity exhibits a strong temperature dependence in the vicinity of magnetic phase transitions. This behavior may be correlated with the presence of competing magnetic interactions (magnetic polarons) close to the magnetic transitions.
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