High-resolution photoelectron spectroscopy study of Kondo metals: SmSn3and Sm0.9La0.1<

Abstract

We performed a high-resolution photoelectron spectroscopy study on the Kondo metals SmSn 3 and Sm 0.9 La 0.1 Sn 3. The experimental results are compared with calculations of density of state performed within the local density approximation plus the dynamical mean-field theory. The theory is found to reproduce the experimental valence-band spectra well. In both SmSn 3 and Sm 0.9 La 0.1 Sn 3 the bulk Sm valence is nearly trivalent, with a small fraction of divalent component. Resonant photoelectron spectroscopy indicates a decrease in the Kondo effect in the diluted system Sm 0.9 La 0.1 Sn 3 .

Electronic structure of the heavy-fermion caged compoundCe3Pd20X6(X=Si,Ge)Yamaoka1, Schwier2, Arita3 et al. 2015Phys. Rev. BSelf Cite6480View full textAdd to dashboardCite

“…In this paper we report results of DFT calculations as well as ultraviolet (UV) and soft x-ray (SX) photoelectron spectroscopy measurements 28,29 for Ce 3 Pd 20 X 6 (X = Si, Ge). We present calculations of the electronic states of both compounds and discuss the site and spin resolved nature of the Pd and Ce contributions to the electronic structure.…”

Electronic structure and the valence state ofYb2Pd2SnandYbPdYamaoka1, Thunström2, Tsujii3 et al. 2012Phys. Rev. BSelf Cite9050View full textAdd to dashboardCite

“…In Yb 2 Pd 2 Sn, the inelastic mean-free path of the photoelectrons is estimated to be on the order of 0.6 nm at hν = 182 eV, 29,40 which is comparable to the lattice constants of a = 0.7573 and c = 0.3638 nm. The inelastic electron mean-free path of YbPd 2 Sn at hν = 182 eV is estimated to be on the order of 0.75 nm, which is comparable to the value for Yb 2 Pd 2 Sn.…”

“…These scaling constants account for the screening by the non-f electrons and are roughly material independent. 29 The final fully self-consistent values are F 2 = 14.2, F 4 = 9.3 , and F 6 = 6.9 eV. The Hubbard U parameter F 0 cannot be calculated in the same way as it is too strongly screened.…”

“…The electron emissions from direct photoionization processes and super-Coster-Kronig-Auger decay processes, respectively, are written as hν + 4d 10 4f 13 → 4d 9 4f 14 → 4d 10 4f 12 l + e k , hν + 4d 10 4f 13 → 4d 10 4f 12 l + e k , where e k is the emitted electrons. 29,45 They have the same initial and final states, and thus, the Fano profile can be observed if the interaction occurs between the discrete state (4d 9 4f 14 ) and the continuum state (4d 10 4f 12 l + e k ). The CIS spectra are well fitted with the Fano profile I = I 0 + I 1 (q + E) 2 /(1 + E 2 ) [E = (hν − E 0 )/ ] as shown in Fig.…”

“…We compare the multiplet structure of the photoelectron spectra with the density of states (DOS) calculated using a combination of density-functional theory in the local density approximation (LDA), dynamical mean-field theory (DMFT), and the Hubbard-I approximation. [25][26][27][28][29] …”