Core-level photoemission spectra of Mo0.3Cu0.7Sr2ErCu2Oy, a superconducting perovskite derivative. Unconventional structure-property relationships

Dalton Transactions : an International Journal of Inorganic Chemistry
Sourav MarikM A Alario-Franco

Abstract

Detailed studies of the electronic states for Mo(0.3)Cu(0.7)Sr(2)ErCu(2)Oy samples with different oxygen contents are presented here. The influence of oxygenation on the electronic states for the Mo(0.3)Cu(0.7)Sr(2)ErCu(2)Oy system from the semiconducting to the superconducting state has been investigated by means of X-ray photoelectron spectroscopy (XPS). The XPS studies show that Mo is in a mixed Mo(V) and Mo(VI) oxidation state and Mo(V) is predominant over the Mo(VI) in the as-prepared (AP) sample. Yet annealing under an oxygen atmosphere enhances the Mo(VI) state. At the same time, a reduction in the copper species is observed. In the Cu 2p spectra, a larger energy separation between the satellite and main peaks (E(S)-E(M)) and a lower intensity ratio (I(S)/I(M)) are found to correlate with higher values of the superconducting transition temperature (T(C)). Analysis of these spectra within the Configuration Interaction (CI) model suggests that higher values of TC are related to lower values of the O 2p-Cu 3d charge transfer energy. The change in the Sr 3d and O 1s core level spectra correlates with the oxygen insertion in the (Mo/Cu)O(1+δ) chain site, after oxygenation. The hole concentration (Ph) in the copper plane has b...Continue Reading

References

Mar 1, 1988·Physical Review. B, Condensed Matter·F C Zhang, T M Rice
Jan 1, 1989·Physical Review. B, Condensed Matter·F U HillebrechtA Zettl
Nov 1, 1989·Physical Review. B, Condensed Matter·J B TorranceG A Held
Jun 1, 1990·Physical Review. B, Condensed Matter·K AllanJ B Goodenough
May 1, 1993·Physical Review. B, Condensed Matter·Q XiongC W Chu

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