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.

arXiv comment7 pages, 5 figures (V2 contains a revised discussion of the structural phase transition)

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Cited by in corpus (6)

• Quasiparticle and Nonquasiparticle Transport in Doped Quantum Paraelectrics
• Heavy non-degenerate electrons in doped strontium titanate
• Charge Transport in a Polar Metal
• Huge permittivity and premature metallicity in Bi${}_2$O${}_2$Se single crystals
• Ferroelectric order versus metallicity in Sr${}_{1-x}$Ca${}_x$TiO${}_{3-\delta }$ ($x=0.009$)
• Controlling the electrical and magnetic ground states by doping in the complete phase diagram of titanate Eu1-xLaxTiO3 thin films