Magnetotransport Properties of Eu1−xLaxTiO3 (0 ≤ x ≤ 0.07) Single Crystals

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Abstract
The electronic phase change from an antiferromagnetic insulator to an antiferromagnetic/ferromagnetic-like metal has been investigated for the electron-doped EuTiO3, i.e., the single crystals of Eu1−xLaxTiO3 (0 ≤ x ≤ 0.07) prepared by the floating zone method. The EuTiO3 (x = 0) crystal is an insulator, and Eu 4f electrons exhibit an antiferromagnetic spin ordering at TN ∼ 5.5 K. Upon the substitution of Eu2+ with La3+, a metallic state appears for x ≥ 0.01; this state is similar to the isostructural Sr1−xLaxTiO3. As x increases from 0.01 to 0.07, TN decreases from 5.5 to 3 K. For x = 0.07, the transition to the antiferromagnetic state seems to be followed by the appearance of a ferromagnetic-like state at a higher temperature (∼4.5 K). In the temperature profiles of resistivity for the crystals with 0.01 ≤ x ≤ 0.07, an anomaly is observed at the temperature for the spin ordering of Eu 4f electrons, which reflects the exchange coupling between itinerant Ti 3d and Eu 4f electrons. Magnetotransport properti...

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