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The mechanical properties of materials are insensitive to space inversion, even when they are crystallographically asymmetric. In practice, this means that turning a piezoelectric crystal upside down or switching the polarization of a ferroelectric should not change its mechanical response. Strain gradients, however, introduce an additional source of asymmetry that has mechanical consequences. Using...
In article number 1702210, Kumara Cordero‐Edwards, Gustau Catalan, and co‐workers demonstrate that the mechanical indentation response of a piezoelectric crystal can be changed just by turning it upside down – or, if it is ferroelectric, by switching its polar axis with an external voltage. Thus, in addition to already being smart functional materials, this discovery places ferroelectrics as “smart...
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