Kondo Resonance in PrTi2Al20: Photoemission spectroscopy and single-impurity Anderson model

TL;DR

This study demonstrates the presence of Kondo resonance at the Fermi level in PrTi2Al20, a Pr-based f2 system, using resonant photoemission spectroscopy and theoretical SIAM calculations, expanding understanding beyond Ce and Yb systems.

Contribution

It provides experimental and theoretical evidence that f2 systems like PrTi2Al20 can exhibit Kondo resonance, previously known mainly for f1 systems.

Findings

Kondo resonance observed in PrTi2Al20 at the Fermi level.

Resonance peak reproduced by SIAM calculations with tuned hybridization.

Kondo effect extends to f2 electron systems, not just f1 or f1 hole systems.

Abstract

The Kondo resonance at the Fermi level is well-established for the electronic structure of Ce (f1 electron) and Yb (f1 hole) based systems. In this work, we report complementary experimental and theoretical studies on the Kondo resonance in Pr-based f2 system, PrTi2Al20. Using Pr 3d-4f resonant photoemission spectroscopy and single impurity Anderson model (SIAM) calculations including the full multiplets of Pr ions, we show that an f2 system can also give rise to a Kondo resonance at the Fermi level. The Kondo resonance peak is experimentally observed through a final-state-multiplet dependent resonance and is reproduced with properly tuned hybridization strength in SIAM calculations.