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Optical second-harmonic generation (SHG) in SrTi16O3 (STO16) and SrTi18O3(STO18) was investigated using the SHG microscope. While no-biased STO16exhibits weak and almost temperature-independent SHG signals, a marked SHG isobserved under the electric field in the quantum paraelectric region. In STO18,strong SHG signals appear spontaneously below 36K. However, neutron and X-raydiffraction analyses indicate that no structural change appears at lowtemperature in STO18, and STO16 under the electric field. By taking intoaccount the fact that the SHG is sensitive to the local polar-order, thecombined studies reveals that the long-range order of polar phase does notdevelop on the both crystals and is frozen in local regions.Comment: soumis a JPSJ -lettr

Polar Order in Quantum Paraelectric SrTi16O3and SrTi18O3at Low Temperature

Polar Order in Quantum Paraelectric SrTi¹⁶O₃and SrTi¹⁸O₃at Low Temperature