摘要
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.
原文 | English |
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頁(從 - 到) | 7203-7206 |
頁數 | 4 |
期刊 | Physical Review B |
卷 | 35 |
發行號 | 13 |
DOIs | |
出版狀態 | Published - 1987 |
All Science Journal Classification (ASJC) codes
- 凝聚態物理學