X-ray-absorption studies of the high-Tc superconductors La1.8Sr0.2CuO4 and La1.8Ba0.2CuO4

J. B. Boyce, F. Bridges, T. Claeson, T. H. Geballe, C. W. Chu, J. M. Tarascon

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X-ray absorption studies of La1.8Sr0.2CuO4 and La1.8Ba0.2CuO4 indicate that no structural transition that alters the valence or the near-neighbor environment by >0.01 A occurs between 4 and 300 K. The doping with Sr and Ba primarily changes the Cu-O distance and width along the c axis. The larger width of the superconducting transition region observed in the Ba-doped material may result from its larger static disorder. Estimates of the Cu-O vibrational frequencies suggest that a phonon-coupling mechanism is just compatible with the observed Tc.

Original languageEnglish
Pages (from-to)7203-7206
Number of pages4
JournalPhysical Review B
Issue number13
Publication statusPublished - 1987

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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