We report a quantum paraelectric (QP) to dipolar glass (DG) phase transition induced by Sc substitution in ferrimagnetic hexaferrite BaFe 12 − x Sc x O 19 ( 0 ≤ x ≤ 2.4) single crystals. The DG behavior is revealed via anisotropic dielectric spectroscopy, polarization, and specific heat measurements. The phase evolution from QP to DG ( 0.5 ≤ x ≤ 1.2) and finally to the nonpolar state ( x ≥ 2.4) with increasing x is found to be due to the competition between the enhanced polar instability by lattice volume expansion and disordered/frustrated dipole-dipole interaction induced by the partial replacement of Sc 3 + for Fe 3 + in the bipyramids. Our results suggest further experimental clues to realize possible multiferroicity with strong displacive ferroelectricity in BaFe 12 O 19 and other magnetic materials.We report a quantum paraelectric (QP) to dipolar glass (DG) phase transition induced by Sc substitution in ferrimagnetic hexaferrite BaFe 12 − x Sc x O 19 ( 0 ≤ x ≤ 2.4) single crystals. The DG behavior is revealed via anisotropic dielectric spectroscopy, polarization, and specific heat measurements. The phase evolution from QP to DG ( 0.5 ≤ x ≤ 1.2) and finally to the nonpolar state ( x ≥ 2.4) with increasing x is found to be due to the competition between the enhanced polar instability by lattice volume expansion and disordered/frustrated dipole-dipole interaction induced by the partial replacement of Sc 3 + for Fe 3 + in the bipyramids. Our results suggest further experimental clues to realize possible multiferroicity with strong displacive ferroelectricity in BaFe 12 O 19 and other magnetic materials.

中文翻译：

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Sc掺杂的BaFe 12 O 19 单晶中的量子顺电偶极玻璃化转变

我们报告了由亚铁磁六铁氧体 BaFe 12 - x Sc x O 19 (0 ≤ x ≤ 2.4) 单晶中的 Sc 取代引起的量子顺电 (QP) 到偶极玻璃 (DG) 相变。DG 行为是通过各向异性介电光谱、极化和比热测量来揭示的。发现随着 x 的增加，从 QP 到 DG ( 0.5 ≤ x ≤ 1.2) 并最终到非极性状态 ( x ≥ 2.4 ) 的相演变是由于晶格体积膨胀和无序/受挫偶极子增强的极性不稳定性之间的竞争-偶极相互作用由双锥体中的 Sc 3 + 部分替换为 Fe 3 + 引起。我们的结果提出了进一步的实验线索，以在 BaFe 12 O 19 和其他磁性材料中实现具有强位移铁电性的可能的多铁性。我们报告了由亚铁磁六铁氧体 BaFe 12 - x Sc x O 19 (0 ≤ x ≤ 2.4) 单晶中的 Sc 取代引起的量子顺电 (QP) 到偶极玻璃 (DG) 相变。DG 行为是通过各向异性介电光谱、极化和比热测量来揭示的。发现随着 x 的增加，从 QP 到 DG ( 0.5 ≤ x ≤ 1.2) 并最终到非极性状态 ( x ≥ 2.4 ) 的相演变是由于晶格体积膨胀和无序/受挫偶极子增强的极性不稳定性之间的竞争-偶极相互作用由双锥体中的 Sc 3 + 部分替换为 Fe 3 + 引起。我们的结果提出了进一步的实验线索，以在 BaFe 12 O 19 和其他磁性材料中实现具有强位移铁电性的可能的多铁性。