Abstract
We report the impact of Nb substitution in EuTi1-xNbxO3 (x = 0, 0.01, 0.03, 0.06 and 0.1) on the magnetization, resistivity, magnetoresistance (MR), thermopower (S) and thermal conductivity (κ) over a wide temperature range (T = 390–2.5 K). Partial replacement of Ti by Nb weakens the antiferromagnetic coupling between Eu-4f spins, drastically reduces low-temperature resistivity and induces insulator-metal transition above the Neel temperature. MR is negative and decreases from 20% for x = 0.01–0.5% for x = 0.1 at 2.5 K but the sign of MR changes to positive at higher temperatures for x = 0.06 and 0.1. The negative MR is suggested due to spin-dependent scattering of Ti-3d conduction electrons by localized Eu-4f spins and we fitted the experimental data to a theoretical model. The negative sign of S asserts electron doping. The values of S and κ systematically decrease with increasing Nb content. κ(T) is analyzed using the Debye-Callaway model.
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