Fig. 4: Flexo-polar phase transition in SrRuO3.
From: Flexoelectric polarizing and control of a ferromagnetic metal
a, Temperature-dependent SHG intensity IPP(2ω), obtained for the Pin–Pout configuration. b, Temperature-dependent evolution of the (111) d spacing of SrRuO3 (blue circles) and SrTiO3 (grey squares). The uncertainty of the d spacing in our measurement (Methods) is approximately 3 × 10−5 and 1 × 10−6 Å for SrRuO3 and SrTiO3, respectively, but not shown here. The red solid line shows the predicted lattice evolution of the polar SrRuO3. The red and black dashed lines show the lattice evolution, depending linearly on temperature, of nonpolar SrRuO3 and SrTiO3, respectively.
