Unveiling the 5$f$ electron hybridization process in UPd$_2$Al$_3$ via ARPES and Time-resolved PES

Jiao-Jiao Song, Qi-Yi Wu, Chen Zhang, Steve M. Gilbertson, Peter S. Riseborough, Jan Rusz, John J. Joyce, Kevin S. Graham, Clifford G. Olson, Paul H. Tobash, Eric D. Bauer, Bo Chen, Hao Liu, Yu-Xia Duan, Peter M. Oppeneer, George Rodriguez, Tomasz Durakiewicz, Jian-Qiao Meng
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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.
通过 ARPES 和时间分辨 PES 揭示 UPd$_2$Al$_3$ 中的 5$f$ 电子杂化过程
本研究采用角度分辨光发射光谱(ARPES)和时间分辨光发射光谱(tr-PES)相结合的方法,研究了重费米子超导体 UPd$_2$Al$_3$ 中的 5$f$ 电子-传导电子杂化过程。ARPES 测量显示在大约 75 K 的温度下形成了杂化间隙,随着温度的降低,杂化间隙变得更加明显。值得注意的是,在远高于杂化起始温度的条件下,U5$f$平坦带的持续存在挑战了传统的理解。我们的发现证明了类粒子弛豫时间的非单调温度依赖性,在 20 K 时出现异常减少,这表明存在复杂的电子和磁相互作用。这些发现提供了对 UPd$_2$Al$_3$ 中 5$f$ 电子杂化过程的详细见解,对理解重费米子超导性和 5$f$ 电子杂化在铀基材料中的作用具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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