首页|Heterogeneous magneto-electric response in Mn-doped SrTiO3
Heterogeneous magneto-electric response in Mn-doped SrTiO3
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NSTL
Elsevier
The consecutive spin and structural glass features were observed in polycrystalline Sr0middot98Mn0middot02TiO3 previously. Here, the dielectric spectra with higher harmonics have been analyzed by different perturbing electric fields cooling under various magnetic fields across these transitions. Two relaxations are present below the structural glass transition T-g. It is inferred that the high-frequency saddle-like relaxation occurs due to the reorientation of almost antiferroelectrically coupled Mn-doped dipoles (Mn-Sr(2+)) associated with TiO6 octahedra, and the Arrhenius-like low-frequency response comes from individual reorientation of Mn-Sr(2+). They merge above the T-g, and Mn-Sr(2+) respond collectively with induced polar cluster reversal. High-frequency relaxation is glassy, whereas low-frequency relaxation is relaxor-like due to the presence of second harmonics. Subtracted spectra from high-field to low-field show that the energy absorption is non-uniform. Below T-g, the energy absorption becomes minimum with reducing permittivity under an intermediate magnetic field, indicating a decrease in electric potential barrier by magnetic ordering.