Infrared vibrations in LaSrGaO4 and LaSrAlO4

被引：50

作者：

Humlícek, J

Henn, R

Cardona, M

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Masaryk Univ, Fac Sci, Dept Solid State Phys, CS-61137 Brno, Czech Republic

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.61.14554

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the c-axis and the in-plane infrared response of the anisotropic crystals of LnSrGaPO(4) and LaSrAlO4. We identify both transverse and longitudinal phonons. The lattice bands show pronounced features of mode coupling, which we attribute to the random distribution of La and Sr atoms in the lattice. We present a scheme to identify and quantify the coupling that induces the asymmetric line shapes. We use the results to discuss infrared-active vibrations of other compounds, including La2CuO4.

引用

页码：14554 / 14563

页数：10

共 31 条

[1] APPROXIMATE SOLUTION OF ELLIPSOMETRIC EQUATIONS FOR OPTICALLY BIAXIAL CRYSTALS [J].