Charge transport in oxygen-deficient EuTiO${}_3$: the emerging picture of dilute metallicity in quantum-paraelectric perovskite oxides

Abstract

We report on a study of charge transport in EuTiO${}_{3-\delta }$ single crystals with carrier density tuned across several orders of magnitude. Comparing this system with other quasi-cubic perovskites, in particular strontium titanate, we draw a comprehensive picture of metal-insulator transition and dilute metallicity in this $AB$O${}_3$ family. Because of a lower electric permittivity, the metal-insulator transition in EuTiO${}_{3-\delta }$ occurs at higher carrier densities compared to SrTiO${}_3$. At low temperature, a distinct $T^2$ resistivity is visible. Its prefactor $A$ smoothly decreases with increasing carrier concentration in a similar manner in three different perovskites. Our results draw a comprehensive picture of charge transport in doped quantum paraelectrics.

7 pages, 5 figures (V2 contains a revised discussion of the structural phase transition)

References in corpus (3)

• Fermi surface of the most dilute superconductor
• Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics
• Interplay between antiferrodistortive, ferroelectric and superconducting instabilities in Sr_{1-x}Ca_{x}$TiO_{3-δ}

Cited by in corpus (1)

• Controlling the electrical and magnetic ground states by doping in the complete phase diagram of titanate Eu1-xLaxTiO3 thin films