Evidence of polar nanoregions in quantum paraelectric KTaO3

Linear and nonlinear dielectric properties of nominally pure quantum paraelectric potassium tantalate KTaO3 crystals are presented. By use experimental technique to get the higher order electric susceptibility χ2, and χ3, in addition to the linear one, χ1, dielectric loss factor, and the polarization, obtained by integrating the depolarization current measured on zero field heating (ZFH) after field cooling (FC) run, we have proved existence of polar nanoregions (PNR׳s for short) below 40 K in nominally pure potassium tantalate KTaO3 single crystal.