Comparative high-resolution temperature-dependent photoemission measurements were performed for UPd2Al3 and UPd3. The photoemission spectrum near EF of UPd2Al3 consists of a sharp peak at EF and a broad band at 0.5-1.0 eV binding energy, both features having U 5f character. The sharp feature at EF shows good agreement with a recent band structure calculation, while the broad band matches well with the U 5f-derived localized feature in UPd3, indicating the dual character of 5f electrons in UPd2Al3. The intensity of the broad band relative to the EF-peak increases with increasing temperature, suggesting that the localized character of 5f electrons in UPd2Al3 increases at higher temperatures. These observations are consistent with the transport and magnetic measurements which imply a temperature-dependent dual (itinerant and localized) character of U 5f electrons in UPd2Al3.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)