Antiferroelectric negative capacitance from a structural phase transition in zirconia

TL;DR

This paper demonstrates that structural phase transitions in antiferroelectric ZrO₂ induce negative capacitance, expanding the understanding of negative capacitance phenomena beyond traditional ferroelectric materials and offering potential for energy-efficient electronic devices.

Contribution

It reveals that structural transitions in ZrO₂ lead to negative capacitance, providing new insights into antiferroelectric behavior and broadening the scope of negative capacitance applications.

Findings

Structural transition in ZrO₂ causes negative capacitance.

Negative capacitance observed beyond ferroelectric materials.

Insights into thermodynamic aspects of antiferroelectric transition.

Abstract

Crystalline materials with broken inversion symmetry can exhibit a spontaneous electric polarization, which originates from a microscopic electric dipole moment. Long-range polar or anti-polar order of such permanent dipoles gives rise to ferroelectricity or antiferroelectricity, respectively. However, the recently discovered antiferroelectrics of fluorite structure (HfO$_2$ and ZrO$_2$) are different: A non-polar phase transforms into a polar phase by spontaneous inversion symmetry breaking upon the application of an electric field. Here, we show that this structural transition in antiferroelectric ZrO$_2$ gives rise to a negative capacitance, which is promising for overcoming the fundamental limits of energy efficiency in electronics. Our findings provide insight into the thermodynamically 'forbidden' region of the antiferroelectric transition in ZrO$_2$ and extend the concept of negative capacitance beyond ferroelectricity. This shows that negative capacitance is a more general phenomenon than previously thought and can be expected in a much broader range of materials exhibiting structural phase transitions.