Local lattice instability and superconductivity in La1.85Sr0.15Cu1−xMxO4 (M=Mn, Ni, and Co)

C. J. Zhang; H. Oyanagi

doi:10.1103/PhysRevB.79.064521

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Local lattice instability and superconductivity in La1.85Sr0.15Cu1−xMxO4 (M=Mn, Ni, and Co)

C. J. Zhang, H. Oyanagi

DOI 10.1103/PhysRevB.79.064521 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37.7	Pressure not reported	onset
La1.85Sr0.15Cu1-xMnxO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36.5	Pressure not reported	onset
La1.85Sr0.15Cu1-xNixO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	onset