Giant spectral renormalization and complex hybridization physics in a Kondo lattice system, CeCuSb2

TL;DR

This study explores the complex electronic structure and hybridization effects in the Kondo lattice system CeCuSb2, revealing surface-bulk differences, temperature effects, and spectral features linked to its exotic properties.

Contribution

It provides the first detailed depth-resolved analysis of CeCuSb2's electronic structure, highlighting the role of Ce-Sb hybridization and surface effects in its electronic behavior.

Findings

Surface and bulk spectra differ significantly.

Temperature alters Ce-Sb hybridization.

Complex spectral features indicate strong hybridization effects.

Abstract

We investigate the electronic structure of a Kondo lattice system, CeCuSb2 exhibiting significant mass enhancement and Kondo-type behavior. We observe multiple features in the hard x-ray photoemission spectra of Ce core levels due to strong final-state effects. The depth-resolved data exhibit a significant change in relative intensity of the features with the surface sensitivity of the probe. The extracted surface and bulk spectral functions are different and exhibit a Kondo-like feature at higher binding energies in addition to the well and poorly screened features. The core-level spectra of Sb exhibit huge and complex changes as a function of the surface sensitivity of the technique. The analysis of the experimental data suggests that the two non-equivalent Sb sites possess different electronic structures and in each category, the Sb layers close to the surface are different from the bulk ones. An increase in temperature influences the Ce-Sb hybridization significantly. The plasmon-excitation-induced loss features are also observed in all core level spectra. All these results reveal the importance of Ce-Sb hybridizations and indicate that the complex renormalization of Ce-Sb hybridization may be the reason for the exotic electronic properties of this system.