Raman Tensor Analysis of Crystalline Lead Titanate by Quantitative Polarized Spectroscopy

Abstract

Recently, the mode splitting of B₁+E in PbTiO₃-related heterostructures has been attracted wide range of attention because it is considered to represent intrinsic stress in the materials. However, the spectral behaviour of B₁+E mods had remained unclear even in the bulk crystal, i.e., they had been often designated as “silent,” even though they should be Raman active. This seems because they does not exhibit a significant mode splitting in the bulk crystal. This work employed an angle-resolved quantitative polarized spectroscopy to clarify the unclarity. The precise measurements revealed that the both two modes are ordinary Raman active modes with a minute energy difference.

Keywords:

• Raman spectroscopy
• Raman tensor
• lead titanate