Local lattice structure in Mn-dopedLa2−xSrxCuO4studied by Cu and MnK-edge XAFS
Local lattice structure in Mn-dopedLa2−xSrxCuO4studied by Cu and MnK-edge XAFS
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DOI：
10.1103/physrevb.75.174504
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发表时间：
2007-05
影响因子：
3.7
通讯作者：
C. J. Zhang;H. Oyanagi;B. Kim;Y. W. Park;Y. Zhang
中科院分区：
文献类型：
--
作者：
C. J. Zhang;H. Oyanagi;B. Kim;Y. W. Park;Y. Zhang
用Cu K边和Mn K边X射线吸收近边结构和扩展X射线吸收精细结构研究了Mn掺杂La{sub 2-x}Sr{sub x}CuO{sub 4}在10 ~ 300 K的局域晶格结构.结果表明，Mn离子的掺杂位置在La{sub 2-x}Sr{sub x}CuO{sub 4}相的Cu位，样品中没有La{sub 1-x}Sr{sub x}MnO{sub 3}等杂质相。结果表明，Mn杂质对Cu的局域晶格结构没有影响，Mn的局域晶格环境与Cu的相似。我们认为Mn杂质只局部破坏了Cu-O p-d杂化，而远离杂质区域的局部晶格环境和超导电性未受影响。这一结果表明，局域晶格不均匀性在高温超导机制中起着重要的作用。
The local lattice structures in Mn-doped La{sub 2-x}Sr{sub x}CuO{sub 4} are investigated by Cu K-edge and Mn K-edge x-ray-absorption near-edge structure and extended x-ray-absorption fine structure from 10 to 300 K. The results confirm that the doped Mn ions are located at the Cu site of La{sub 2-x}Sr{sub x}CuO{sub 4} phase and the impurity phases, such as La{sub 1-x}Sr{sub x}MnO{sub 3}, are not presented in the samples. It is found that the local lattice structures of Cu are not affected by Mn impurities and the local lattice environments of Mn are similar to those of Cu. We consider that the Mn impurities only break the Cu-O p-d hybridization locally, while the local lattice environments and the superconductivity in the regions away from the impurities remain untouched. This result implicates that local lattice inhomogeneity plays an important role in the mechanism of high-temperature superconductivity.