SrTiO is generally paraelectric with centrosymmetric structure exhibiting unique quantum fluctuation related ferroelectricity. Here we reveal highly polar and periodic polarization waves in SrTiO at room temperature, which is stabilized by periodic tensile strains in a sandwiched PbTiO/SrTiO/PbTiO structure. Scanning transmission electron microscopy reveals that periodic / domain structures in PbTiO layers exert unique periodic tensile strains in the ultrathin SrTiO layer and consequently make the highly polar and periodic states of SrTiO. The as-received polar SrTiO layer features peak polar ion displacement of ∼0.01 nm and peak tetragonality of ∼1.07. These peak values are larger than previous results, which are comparable to that of bulk ferroelectric PbTiO. Our results suggest that it is possible to integrate large and periodic strain state in oxide films with exotic properties, which in turn could be useful in optical applications and information addressing when used as memory unit.
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