The optical conductivity σ(ω,T) of CeRhSn was studied by broadband infrared spectroscopy. Temperature-dependent spectral weight transfer occurs over high energy (0.8eV) and temperature (∼500K) scales, classifying CeRhSn as a mixed valent compound. The optical conductivity reveals a substantial anisotropy in the electronic structure. Renormalization of σ(ω,T) occurs as a function of temperature to a coherent Kondo state with concomitant effective mass generation. Associated spectroscopic signatures were reproduced remarkably well by the combination of density functional theory and dynamical mean field theory using a momentum-independent self energy. The theory shows that the anisotropy for energies >10meV is mainly driven by the bare three-dimensional electronic structure that is renormalized by local electronic correlations. The possible influence of magnetic frustration and quantum criticality is restricted to lower energies.
@article{arxiv.2406.01516,
title = {Anisotropic hybridization in CeRhSn},
author = {Thomas U. Böhm and Nicholas S. Sirica and Bo Gyu Jang and Yu Liu and Eric D. Bauer and Yue Huang and Christopher C. Homes and Jian-Xin Zhu and Filip Ronning},
journal= {arXiv preprint arXiv:2406.01516},
year = {2024}
}