Local lattice instability and stripes in the CuO 2 plane of the La 1.85 Sr 0.15 CuO 4 system by polarized XANES and EXAFS
Local lattice instability and stripes in the CuO 2 plane of the La 1.85 Sr 0.15 CuO 4 system by polarized XANES and EXAFS
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通过偏振 XANES 和 EXAFS 观察 La 1.85 Sr 0.15 CuO 4 系统的局部晶格不稳定性和 CuO 2 平面条纹
DOI：
10.1103/physrevb.55.12759
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发表时间：
1997
影响因子：
3.7
通讯作者：
A. Bianconi
中科院分区：
文献类型：
--
作者：
N. Saini;A. Lanzara;H. Oyanagi;H. Yamaguchi;K. Oka;T. Ito;A. Bianconi
利用极化Cu K边X射线吸收谱研究了La 1.85 Sr 0.15 CuO 4体系中CuO 2面的局域结构畸变. Cu-O对分布显示存在含有CuO 6八面体的少数相，其特征在于较短的Cu-O（顶）键（ΔR <$-0.1 <$）和两个较长的Cu-O（平面）键（ΔR <$+ 0.08 <$），倾斜角为16±2。温度依赖的失真显示出最大值周围T（λ 1）。6 Tc），最小值为Tc（~ 35 K）。数据表明，在超导相的不同条纹的两种类型的掺杂电荷的共存。
Temperature-dependent polarized Cu K-edge x-ray absorption has been used to investigate local structural distortions in the CuO 2 plane of the La 1.85 Sr 0.15 CuO 4 system. The Cu-O pair distribution shows the presence of a minority phase containing CuO 6 octahedra characterized by a shorter Cu-O (apical) bond (ΔR∼-0.1 Å) and two longer Cu-O (planar) bonds (ΔR∼+ 0.08 Å) and a tilting angle of 16±2. The temperature-dependent distortions show a maximum around T (∼ 1. 6 T c) and a minimum at T c (∼ 35 K). The data show the coexistence of two types of doped charges in different stripes in the superconducting phase.