Intrinsic ionic screening of the ferroelectric polarization of KTP

Mario Maglione (1) , Anand Theerthan (1) , Vincent Rodriguez (2) , Alexandra Pena (3) , Carlota Canalias (4) , Bertrand Ménaert (5) , Benoit Boulanger (3)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 ISM - Institut des Sciences Moléculaires
3 NEEL - OPTIMA - Optique et Matériaux
4 KTH - KTH Royal Institute of Technology [Stockholm]
5 NEEL - CrisMass - Cristaux massifs

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.

Domaines: Matériaux

Mario Maglione, Anand Theerthan, Vincent Rodriguez, Alexandra Pena, Carlota Canalias, et al.. Intrinsic ionic screening of the ferroelectric polarization of KTP. Optical Materials Express, 2016, 6 (1), pp.137-145. ⟨10.1364/OME.6.000137⟩. ⟨hal-01233699⟩