1. Unveiling the 5$f$ electron hybridization process in UPd$_2$Al$_3$ via ARPES and Time-resolved PES
- Author
-
Song, Jiao-Jiao, Wu, Qi-Yi, Zhang, Chen, Gilbertson, Steve M., Riseborough, Peter S., Rusz, Jan, Joyce, John J., Graham, Kevin S., Olson, Clifford G., Tobash, Paul H., Bauer, Eric D., Chen, Bo, Liu, Hao, Duan, Yu-Xia, Oppeneer, Peter M., Rodriguez, George, Durakiewicz, Tomasz, and Meng, Jian-Qiao
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Superconductivity - Abstract
This study investigates the 5$f$-electron-conduction electron hybridization process in the heavy fermion superconductor UPd$_2$Al$_3$ using a combination of angle-resolved photoemission spectroscopy (ARPES) and time-resolved photoemission spectroscopy (tr-PES). ARPES measurements reveal the formation of a hybridization gap at a temperature of approximately 75 K, which becomes more pronounced as the temperature decreases. Notably, the persistence of a flat U 5$f$ band at temperatures well above the hybridization onset challenges conventional understanding. Our findings demonstrate a non-monotonic temperature dependence of the quasiparticle relaxation time, with an anomalous decrease at 20 K, suggesting complex electronic and magnetic interactions. These findings provide detailed insights into the 5$f$-electron hybridization process in UPd$_2$Al$_3$, with significant implications for the understanding of heavy fermion superconductivity and the role of 5$f$-electron hybridization in uranium-based materials., Comment: 5 pages, 4 figures
- Published
- 2024