期刊
PHYSICAL REVIEW B
卷 79, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.064521
关键词
bonds (chemical); cobalt; crystal structure; EXAFS; high-temperature superconductors; lanthanum compounds; manganese; nickel; polarons; strontium compounds
资金
- Japan Society for the Promotion of Science (JSPS)
- [2006G117]
- [2006G118]
- [2007G071]
Local lattice structures of La1.85Sr0.15Cu1-xMxO4 (M=Mn, Ni, and Co) single crystals are investigated by polarized extended x-ray absorption fine structure. 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.
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