Domain-induced control of latent heat in freestanding BaTiO$_3$ membranes
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arXiv
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2026
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| author | Bar, Tapas Pesquera, David Villalobos-Martin, Arnau Rodriguez-Tinoco, Cristian Saeed, Umair Cordero-Edwards, Kumara Padilla, Jessica Roque, Jose Manuel Caicedo Santiso, Jose Lloveras, Pol Boron, Leo Lukyanchuk, Igor Catalan, Gustau Rodriguez-Viejo, Javier |
| author_facet | Bar, Tapas Pesquera, David Villalobos-Martin, Arnau Rodriguez-Tinoco, Cristian Saeed, Umair Cordero-Edwards, Kumara Padilla, Jessica Roque, Jose Manuel Caicedo Santiso, Jose Lloveras, Pol Boron, Leo Lukyanchuk, Igor Catalan, Gustau Rodriguez-Viejo, Javier |
| contents | Thin ferroelectric BaTiO$_3$ films often exhibit continuous transitions instead of the first-order behavior of bulk crystals, a discrepancy usually attributed to epitaxial strain or dimensionality. Using quasi-adiabatic nanocalorimetry on freestanding BaTiO$_3$ membranes-free of clamping and substrate heat sinking-we show that domain morphology, not thickness or boundary conditions, controls the transition order. Thick membranes with large, monodomain-like regions display clear latent heat, whereas thinner membranes with dense 180$^{\circ}$ domain patterns show a continuous transition despite undergoing the same tetragonal-cubic structural change confirmed by x-ray diffraction. Piezoresponse force microscopy links this behavior to domain-size evolution, and a Ginzburg-Landau analysis demonstrates how reduced domain size lowers the free-energy barrier, rounding a nominally first-order instability. These results identify domain morphology as the key determinant of ferroelectric transition order in oxide membranes and establish design guidelines for enhancing caloric effects through domain engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26089 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Domain-induced control of latent heat in freestanding BaTiO$_3$ membranes Bar, Tapas Pesquera, David Villalobos-Martin, Arnau Rodriguez-Tinoco, Cristian Saeed, Umair Cordero-Edwards, Kumara Padilla, Jessica Roque, Jose Manuel Caicedo Santiso, Jose Lloveras, Pol Boron, Leo Lukyanchuk, Igor Catalan, Gustau Rodriguez-Viejo, Javier Materials Science Mesoscale and Nanoscale Physics Thin ferroelectric BaTiO$_3$ films often exhibit continuous transitions instead of the first-order behavior of bulk crystals, a discrepancy usually attributed to epitaxial strain or dimensionality. Using quasi-adiabatic nanocalorimetry on freestanding BaTiO$_3$ membranes-free of clamping and substrate heat sinking-we show that domain morphology, not thickness or boundary conditions, controls the transition order. Thick membranes with large, monodomain-like regions display clear latent heat, whereas thinner membranes with dense 180$^{\circ}$ domain patterns show a continuous transition despite undergoing the same tetragonal-cubic structural change confirmed by x-ray diffraction. Piezoresponse force microscopy links this behavior to domain-size evolution, and a Ginzburg-Landau analysis demonstrates how reduced domain size lowers the free-energy barrier, rounding a nominally first-order instability. These results identify domain morphology as the key determinant of ferroelectric transition order in oxide membranes and establish design guidelines for enhancing caloric effects through domain engineering. |
| title | Domain-induced control of latent heat in freestanding BaTiO$_3$ membranes |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.26089 |