Abstract
Photoemission spectra of the La2−x Sr x CuO4 system which recently has been demonstrated of being capable to produce high temperature (T c >35 K) superconducting compounds are reported. The photoemission spectra of the basic system (La2CuO4) and of samples which contain up to 20% Sr are not significantly different. The density of states at the Fermi energy is small (smaller than that of metallic Cu) and the samples show a possible small shift of the Cu 2p lines towards the trivalent position with increasing tendency to superconductivity. From the Sr 3d spectra a considerable amount of oxygen defects coordinated to the Sr ions is estimated.
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Steiner, P., Albers, J., Kinsinger, V. et al. Photoemission investigation of the high temperature superconductors La2−x Sr x CuO4 . Z. Physik B - Condensed Matter 66, 275–278 (1987). https://doi.org/10.1007/BF01305416
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DOI: https://doi.org/10.1007/BF01305416