Evidence for a local lattice distortion in Ca-doped LaMnO3.
Evidence for a local lattice distortion in Ca-doped LaMnO3.
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Ca 掺杂 LaMnO3 中局部晶格畸变的证据。
DOI：
10.1103/physrevb.53.13985
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Zang
中科院分区：
文献类型：
--
作者：
Tyson;Mustre de Leon J;Conradson;Bishop;Neumeier;Roeder;Zang
我们发现，La{sub 2/3}Ca{sub 1/3}MnO{sub 3} 的局部结构发生显着变化，温度范围为 80 K 至高于居里温度 {ital T}{sub {ital c}}=270 K。近边缘 X 射线吸收光谱在 80 K 至高于 {ital T}{sub {ital c}} 之间发生变化。 X 射线吸收精细结构揭示了 80 K 及以上 {ital T}{sub {ital c}} 下最近邻 Mn-O 键分布之间的差异。低温下的单位点分布在 {ital T}{sub {ital c}} 以上变成复杂的多位点分布。观察到的变化与针对 {ital T}{approx_gt}{ital T}{sub {ital c}} 提出的与小极化子相关的局部 Jahn-Teller 畸变一致。 {版权} {ital 1996 美国物理学会。}
We have found that a significant change in the local structure of La{sub 2/3}Ca{sub 1/3}MnO{sub 3} occurs between 80 K and temperatures above the Curie temperature, {ital T}{sub {ital c}}=270 K. Near-edge x-ray-absorption spectra exhibits changes between 80 K and above {ital T}{sub {ital c}}. X-ray-absorption fine structure reveals differences between the nearest-neighbor Mn-O bond distributions at 80 K and above {ital T}{sub {ital c}}. The single-site distribution at low temperature becomes a complex, multi-site distribution above {ital T}{sub {ital c}}. The observed change is consistent with proposed small polaron related local Jahn-Teller distortions for {ital T}{approx_gt}{ital T}{sub {ital c}}. {copyright} {ital 1996 The American Physical Society.}