Negative/positive electrocaloric effect in antiferroelectric squaric acid

Article Physics, Condensed Matter

Electric field induced polarization rotation in squaric acid crystals revisited

A. P. Moina

Summary: In this study, we revisit the problem of electric field induced polarization rotation in antiferroelectric crystals of squaric acid using a previously developed model. By testing an alternative set of model parameters, we confirm the validity of the model through comparison with newly published experimental data. The calculations show no apparent advantage of the new parameter set over the previously used set.

CONDENSED MATTER PHYSICS (2022)

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Article Materials Science, Multidisciplinary

Giant caloric effects close to any critical end point

Lucas Squillante et al.

Summary: The study introduced a new framework based on entropy arguments to achieve giant electrocaloric effects, quantified the electrocaloric effect using the electric Gruneisen parameter GE, discussed potential key-ingredients to enhance the effect, and demonstrated GE as a proper parameter to probe quantum ferroelectricity, ultimately explaining the large electrocaloric effect observed in oxide multilayer capacitors at room temperature.

MATERIALS RESEARCH BULLETIN (2021)

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Article Physics, Condensed Matter

Influence of external field direction on polarization rotation in antiferroelectric squaric acid H2C4O4

A. P. Moina

Summary: The study explores the polarization rotation processes in antiferroelectric crystals of squaric acid under electric fields of different directions, predicting a two-step polarization reorientation at low temperatures and discussing specific cases of field orientations.

CONDENSED MATTER PHYSICS (2021)

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Article Materials Science, Multidisciplinary

Polarization rotation by external electric field in the two-dimensional antiferroelectric squaric acid H2C4O4

A. P. Moina

Summary: A pseudospin model is developed to describe the influence of the electric field on two-dimensional squaric acid antiferroelectrics, leading to the construction of a temperature-electric field phase diagram. Most transitions induced by the field are associated with polarization rotation. The system behavior is characterized by the introduced noncollinearity angle theta, with a crossover region included in the diagram.

PHYSICAL REVIEW B (2021)

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Article Physics, Condensed Matter