Ferroelectricity in Ultrathin<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BaTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Films: Probing the Size Effect by Ultraviolet Raman SpectroscopyD. A. Ténné, S. K. Streiffer, P. H. Fuoss et al.|Physical Review Letters|2009Cited by 147