The Dielectric Response of La0.5Ca0.5-xSrxMnO3 (0.1 <= x <= 0.4) Manganites with Different Magnetic Ground States
Abstract
The dielectric behavior of half doped manganites La0.5Ca0.5-xSrxMnO3 (0.1 ≤ × ≤ 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 ~ 0.12eV, 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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