Soft x-ray absorption studies on high-Tc superconducting oxides

D. Sondericker; Z. Fu; D. C. Johnston; W. Eberhardt

doi:10.1103/PhysRevB.36.3983

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Soft x-ray absorption studies on high-Tc superconducting oxides

D. Sondericker, Z. Fu, D. C. Johnston, W. Eberhardt

DOI 10.1103/PhysRevB.36.3983 · Physical Review B

T1

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Abstract

We report measurements of the Cu 2p, O 1s, and La 3d absorption edges in La2CuO4−y and a Sr-doped, superconducting sample of La1.8Sr0.2CuO4−y. The Cu 2p absorption edge in the superconducting sample is considerably broader and exhibits additional structure compared to the normal La2CuO4−y. This additional structure is consistent with models for the superconductivity, which involve difference valence states of the Cu atoms or different spin configurations at the Cu sites. The oxygen edge exhibits fine structure which changes with sample preparation and is presumably due to oxygen defects in the samples.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.8Sr0.2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35	Pressure not reported	unknown