A-site Cation disorder engineering in Ruddlesden-Popper Layered Perovskite Oxide La2(Ba,Sr)In2O7 for Ferroelectricity
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arXiv
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2025
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| author | Terauchi, Takumi Yi, Wei Torii, Rikuto Takada Hirofumi Akamatsu Ryo Ota Shuki Fujita, Koji |
| author_facet | Terauchi, Takumi Yi, Wei Torii, Rikuto Takada Hirofumi Akamatsu Ryo Ota Shuki Fujita, Koji |
| contents | The strategic design of ferroelectric materials exhibiting robust and reversible spontaneous polarization remains a pivotal challenge in functional materials research. Here, A-site cation disorder engineering is employed in the n = 2 Ruddlesden-Popper layered perovskite La2Ba1-xSrxIn2O7 to achieve room-temperature ferroelectricity. Systematic substitution of Sr2+ for Ba2+ drives symmetry transitions from a parent centrosymmetric (CS) P42/mnm structure (x = 0) to two emergent phases: a CS Amam phase (for x from 0.3 to 0.4) and a polar A21am phase (for x from 0.5 to 0.9). Multimodal characterization combining synchrotron diffraction, neutron scattering, nonlinear optical spectroscopy, and hysteresis loop of electric polarization versus electric field reveals a hybrid improper ferroelectric (HIF) mechanism in the A21am phase, arising from trilinear coupling between octahedral rotations and tilts. Cation disorder at A-sites suppresses the interfacial rumpling-induced octahedral elongation (deformation) while enhancing the octahedral rotations which are critical for the polar symmetry stabilization. First-principles calculations further elucidate that Sr/La disorder mitigates electrostatic interactions, enabling oxygen octahedral distortions necessary for ferroelectricity. This work establishes cation disorder engineering as a versatile strategy to design high-temperature multiferroics in layered perovskites, advancing the coupling between structural distortions and functional responses in complex oxides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11033 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A-site Cation disorder engineering in Ruddlesden-Popper Layered Perovskite Oxide La2(Ba,Sr)In2O7 for Ferroelectricity Terauchi, Takumi Yi, Wei Torii, Rikuto Takada Hirofumi Akamatsu Ryo Ota Shuki Fujita, Koji Materials Science The strategic design of ferroelectric materials exhibiting robust and reversible spontaneous polarization remains a pivotal challenge in functional materials research. Here, A-site cation disorder engineering is employed in the n = 2 Ruddlesden-Popper layered perovskite La2Ba1-xSrxIn2O7 to achieve room-temperature ferroelectricity. Systematic substitution of Sr2+ for Ba2+ drives symmetry transitions from a parent centrosymmetric (CS) P42/mnm structure (x = 0) to two emergent phases: a CS Amam phase (for x from 0.3 to 0.4) and a polar A21am phase (for x from 0.5 to 0.9). Multimodal characterization combining synchrotron diffraction, neutron scattering, nonlinear optical spectroscopy, and hysteresis loop of electric polarization versus electric field reveals a hybrid improper ferroelectric (HIF) mechanism in the A21am phase, arising from trilinear coupling between octahedral rotations and tilts. Cation disorder at A-sites suppresses the interfacial rumpling-induced octahedral elongation (deformation) while enhancing the octahedral rotations which are critical for the polar symmetry stabilization. First-principles calculations further elucidate that Sr/La disorder mitigates electrostatic interactions, enabling oxygen octahedral distortions necessary for ferroelectricity. This work establishes cation disorder engineering as a versatile strategy to design high-temperature multiferroics in layered perovskites, advancing the coupling between structural distortions and functional responses in complex oxides. |
| title | A-site Cation disorder engineering in Ruddlesden-Popper Layered Perovskite Oxide La2(Ba,Sr)In2O7 for Ferroelectricity |
| topic | Materials Science |
| url | https://arxiv.org/abs/2503.11033 |