"If you make a strontium titanate film very thin, all of a sudden it becomes ferroelectric at room temperature," "If you make it thicker, ferroelectricity disappears. That's very strange, as it goes completely counter to all the common knowledge regarding the thickness effect on ferroelectric properties." says Alexei Gruverman, a University of Nebraska-Lincoln physics and astronomy professor who worked on the research.
This incongruent materials ferroelectric behaviour is explainded in their communication cf link below
Physicists defy conventional wisdom to identify ferroelectric material | EurekAlert! Science News
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