Decreasing giant splitting of longitudinal and transverse optical phonons in PbxSr1-xTiO3 due to Pb covalency
作者： Shou-Yi Kuo , Chung-Ting Li , Wen-Feng Hsieh
DOI: 10.1063/1.1513660
关键词: Perovskite (structure) 、 Transverse plane 、 Soft modes 、 Crystallite 、 Ferroelectric ceramics 、 Condensed matter physics 、 Phonon 、 Effective nuclear charge 、 Ion 、 Physics
摘要: In contrast to the increase of giant splitting longitudinal optical (LO) and transverse (TO) phonons in polycrystalline BaxSr1−xTiO3 [Phys. Rev. B. 64, 224103-1 (2001)], a decreasing softest A1(1TO) hardest A1(3LO) was observed PbxSr1−xTiO3. A similar structure but anomalous discrepancies lattice dynamics ABO3 perovskite are related diverse electronic states Pb2+ Ba2+ ions. this article, Pb–O interaction is proposed be more hybridized than Ba–O, thus change effective charge LO–TO may dominant mechanism PbxSr1−xTiO3, while unit-cell volume systems.
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