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arXiv 0901.3936cond-mat.supr-con
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La $_{1.85}$ Sr $_{0.15}$ Cu $_{1-x}$ M $_x$ O $_4$(M=Mn,Ni,Co)的局域晶格不稳定性和超导电性

Local Lattice Instability and Superconductivity in La$_{1.85}$Sr$_{0.15}$Cu$_{1-x}$M$_x$O$_4$ (M=Mn, Ni, and Co)

C. J. Zhang, H. Oyanagi

摘要:

用极化扩展X射线吸收精细结构(EXAFS)研究了La $_{1.85}$ Sr $_{0.15}$ Cu $_{1-x}$ M $_x$ O $_4$(M=Mn,Ni,Co)单晶的局域晶格结构.低温下的局域晶格不稳定性可用面内Cu-O键分裂来描述。我们发现,Mn替代Cu引起的局部晶格不稳定性的扰动很小,而Ni和Co替代强烈抑制的不稳定性。Cu位取代对超导电性的抑制与晶格不稳定性的扰动有关,表明局域晶格不稳定性(极化子)在超导电性中起着重要作用。

英文摘要:

Local lattice structures of La$_{1.85}$Sr$_{0.15}$Cu$_{1-x}$M$_x$O$_4$ (M=Mn, Ni, and Co) single crystals are investigated by polarized extended x-ray absorption fine structure (EXAFS). The local lattice instability at low temperature is described by in-plane Cu-O bond splitting. We find that substitution of Mn for Cu causes little perturbation of local lattice instability while Ni and Co substitution strongly suppresses the instability. The suppression of superconductivity by Cu-site substitution is related to the perturbation of lattice instability, indicating that local lattice instability (polaron) plays an important role in superconductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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