Abstract
X-ray photoelectron spectroscopy (XPS) studies were performed on bulk polycrystalline samples of YBa2Cu3O7-x as a function of temperature through the superconducting transition. With decreasing temperature, clear changes were observed in the photoelectron spectrum which can be interpreted as signatures of the Cu3+ and perhaps the Cu1+ oxidation states, in addition to the usual Cu2+ state. These changes were not observed in samples which had been rendered nonsuperconducting by baking in vacuum. These results may have implications for the mechanism for superconductivity in this high-Tc compound.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 9745-9748 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 37 |
| Issue number | 16 |
| DOIs | |
| State | Published - 1988 |
| Externally published | Yes |