We report on the fabrication of epitaxial LaYAlO ultrathin films on (001) LaAlO substrates. Structural characterizations by scanning transmission electron microscopy and x-ray diffraction confirm the high quality of the film with a b c AlO octahedral tilt pattern. Unlike either of the nonpolar parent compound, LaAlO and YAlO, second harmonic generation measurements on the thin films suggest a nonpolar-polar phase transition at T near 500 K, and a polar-polar phase transition at T near 160 K. By fitting the angular dependence of the second harmonic intensities, we further propose that the two polar structures can be assigned to the Pmc2 and Pmn2 space group, while the high temperature nonpolar structure belongs to the Pbnm space group.
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