Oxygen K near-edge X-ray absorption spectroscopy of La2−xMxCuO4 (M = Ca, Sr and Ba) x-Dependence of hole state density

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Abstract

Flourescence-yield oxygen K near-edge X-ray spectroscopy was utilized as a bulk-sensitive method to determine the hole state density of La2−xMxCuO4. Pre-edge features have been measured for M = Sr, 0≤x≤0.40, M = Ba, 0≤x≤0.25, and M = Ca, 0≤x≤0.10. These features occur just above the Fermi level at ∼ 530 and ∼ 528 eV, the 528 eV peak being assigned to holes in the oxygen 2p band. The intensities and energies of these peaks were determined as a function of composition x. Results are qualitatively similar among M = Sr, Ba and Ca. For x≤0.15 the magnitude of the 528 eV peak is linear in x. In the overdoped region, x>0.15, M = Sr, the magnitude begins to saturate.

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Present address: Physics Department, South Dakota School of Mines and Technology, Rapid City, SD 57701-3995, USA.

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