2015/03/20 by Mario Maglione, Maglione, Mario, Anand Theerthan +14
Materials Science · Physics and Astronomy · #Ferroelectric and Piezoelectric Materials #Photorefractive and Nonlinear Optics #Solid-state spectroscopy and crystallography #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1503.06086
10 pages, 5 figures
arxiv created 2015/03/20 · arxiv updated 2015/03/23
Mobile charges and lattice polarization interact in ferroelectric materials because of the Coulomb interaction between the mobile free charges and the fixed lattice dipoles. We have investigated this mutual screening in KTiOPO4, a ferroelectric/superionic single crystal in which the mobile charges are K+ ions. The ionic accumulation close to the crystal surfaces leads to orders of magnitude increase of the Second Harmonic Generation. This ionic space charge model is supported by the absence of such an effect in non-ionic conductor but ferroelectric BaTiO3, by its temperature dependence in KTiOPO4 and by its broad depletion at domain walls.