Effect of cation doping on low-temperature specific heat of LaCoO3 cobaltate

Thakur, Rasna; Thakur, Rajesh K.

doi:10.1016/j.jmmm.2012.08.010

Cited by 4 publications

References 48 publications

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Dielectric, magnetic, and thermodynamic properties of Y1−xSrxMnO3 (x = 0.1 and 0.2)

Thakur

Samatham

et al. 2012

Journal of Applied Physics

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We report the effect of strontium (Sr) doping on dielectric, magnetization, and thermodynamic properties of polycrystalline Y1−xSrxMnO3 (x = 0.1, 0.2) samples prepared by conventional solid-state reaction method. The temperature dependent dielectric permittivity and specific heat curves noticeably show the anomalies near its magnetic transition point, i.e., Neel temperature (TN), which are probably generated by the frustrated Mn3+ spins (S = 2) on a triangular Mn lattice showing the magneto-electric coupling between the electric and magnetic orders. However, the magnetic transition is not clearly evident in the magnetic susceptibility due to the frustration on the Mn triangular lattice and the dominating paramagnetic susceptibility of the Y3+ spins. The electronic transport mechanism in these materials was analyzed within the framework of conventional Arrhenius Law, i.e., ρ(T) = C exp(Ea/kBT) applied to low frequency ac resistivity data, and through the peak method employed to the permittivity and loss tangent by using equation f = f0 exp(−Ea/kBTp), suggests simple thermal activation. The effect of induced Mn4+ ions in the crystal lattice with doping of Sr2+ ion on transport properties has been discussed in details.

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