Neutron Diffraction Evidence of Microscopic Charge Inhomogeneities in the CuO2 Plane of Superconducting La2−xSrxCuO4 ( 0≤x≤0.30)

E. S. Božin; G. H. Kwei; H. Takagi; S. J. L. Billinge

doi:10.1103/PhysRevLett.84.5856

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Neutron Diffraction Evidence of Microscopic Charge Inhomogeneities in the CuO2 Plane of Superconducting La2−xSrxCuO4 ( 0≤x≤0.30)

E. S. Božin, G. H. Kwei, H. Takagi, S. J. L. Billinge

DOI 10.1103/PhysRevLett.84.5856 · Physical Review Letters

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Abstract

High-resolution atomic pair distribution functions have been obtained using neutron powder diffraction data from La2−xSrxCuO4 over the range of doping 0≤x≤0.30 at 10 K. Despite the average structure getting less orthorhombic, we see a broadening of the in-plane Cu-O bond distribution as a function of doping up to optimal doping. Thereafter the peak abruptly sharpens. The peak broadening can be well explained by a local microscopic coexistence of doped and undoped material. This suggests a crossover from a charge inhomogeneous state at and below optimal doping to a homogeneous charge state above optimal doping.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown