Crystal electric field in 
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 studied with high-resolution resonant inelastic soft x-ray scattering

Amorese, Andrea; Caroca‐Canales, N.; Seiro, S.; Krellner, C.; Ghiringhelli, G.; Brookes, N. B.; Vyalikh, D. V.; Geibel, C.; Kummer, K.

doi:10.1103/physrevb.97.245130

Cited by 23 publications

(16 citation statements)

References 35 publications

(60 reference statements)

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“…Actually, the relation a ≃ 1 is reported by recent resonant X-ray scattering experiment in Ref. [44]. In this case, we obtain |V kf1σ /V kf2σ | = √ 5.…”

Section: Modelsupporting

confidence: 78%

Fully gapped s -wave superconductivity enhanced by magnetic criticality in heavy-fermion systems

Tazai¹,

Kontani²

2018

Phys. Rev. B

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In heavy fermion systems, higher-rank multipole operators are active thanks to the strong spinorbit interaction (SOI), and the role of diverse multipole fluctuations on the pairing mechanism attracts a lot of attention. Here, we study a mechanism of superconductivity in heavy fermion systems, by focusing on the impact of vertex corrections (VCs) for the pairing interaction going beyond the Migdal approximation. In heavy fermion systems, strong interference between multipole fluctuations cause significant VCs, that represent many-body effects beyond mean-field-type approximations. Especially, the coupling constants between electrons and charged-bosons, including the electron-phonon coupling constant, are strongly magnified by the VCs. For this reason, moderate even-rank (=electric) multipole fluctuations give large attractive interaction, and therefore s-wave superconductivity can emerge in heavy-fermion systems. In particular, phonon-mediated superconductivity is expected to be realized near the magnetic criticality, thanks to the VCs due to magnetic multipole fluctuations. The present mechanism may be responsible for the fully gapped s-wave superconducting state realized in CeCu2Si2.

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“…Actually, the relation a ≃ 1 is reported by recent resonant X-ray scattering experiment in Ref. [44]. In this case, we obtain |V kf1σ /V kf2σ | = √ 5.…”

Section: Modelsupporting

confidence: 78%

Fully gapped s -wave superconductivity enhanced by magnetic criticality in heavy-fermion systems

Tazai¹,

Kontani²

2018

Phys. Rev. B

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“…Further, considering the nature of a sideband at about −50 meV in the bulk spectrum, we have to emphasize that this feature is determined by two contributions. First, in the bulk, the D 4h symmetry leads to a splitting of the 2 F 5/2 state into three Kramers doublets (Γ 6 and two Γ 7 ) with a CEF scheme determined by inelastic neutron scattering and soft X-ray absorption spectroscopy 24 as well as high-resolution resonant inelastic soft X-ray scattering 25 to be a Γ 7 ground state with the first and second excited states around 30 and 53 meV. The 4f CEF-split states were recently observed in ARPES 10 , where a CEF scheme of 0-48-62 meV was established.…”

Section: Resultsmentioning

confidence: 99%

Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh2Si2

et al. 2020

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Ultra-violet angle-resolved photoemission spectroscopy (UV-ARPES) was used to explore the temperature dependence of the Ce-4f spectral responses for surface and bulk in the antiferromagnetic Kondo lattice CeRh2Si2. Spectra were taken from Ce- and Si-terminated surfaces in a wide temperature range, and reveal characteristic 4f patterns for weakly (surface) and strongly (bulk) hybridized Ce, respectively. The temperature dependence of the Fermi level peak differs strongly for both cases implying that the effective Kondo temperature at the surface and bulk can be rather distinct. The greatly reduced crystal–electric-field (CEF) splitting at the surface gives reason to believe that the surface may exhibit a larger effective Kondo temperature because of a higher local-moment effective degeneracy. Further, the hybridization processes could strongly affect the 4f peak intensity at the Fermi level. We derived the k-resolved dispersion of the Kondo peak which is also found to be distinct due to different sets of itinerant bands to which the 4f states of surface and bulk Ce are coupled. Overall our study brings into reach the ultimate goal of quantitatively testing many-body theories that link spectroscopy and transport properties, for both the bulk and the surface, separately. It also allows for a direct insight into the broader problem of Kondo lattices with two different local-moment sublattices, providing some understanding of why the cross-talking between the two Kondo effects is weak.

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“…The latter capability adds extra selectivity that can be decisive in the assignment of spectral features, in particular when intrinsic broadening or quasi degeneracy of peaks makes high energy resolution partly ineffective. The polarization analysis has been applied to systems other than the cuprates, as in the case of the assignment of the energy and symmetry of f f excitations in CeRh 2 Si 2 32 .…”

Section: Introductionmentioning

confidence: 99%

Polarization-resolved Cu L3 -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7−<

et al. 2019

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High resolution resonant inelastic x-ray scattering (RIXS) has proven particularly effective in the determination of crystal field and spin excitations in cuprates. Its strength lies in the large Cu L3 resonance and in the fact that the scattering cross section follows quite closely the single-ion model predictions, both in the insulating parent compounds and in the superconducting doped materials. However, the spectra become increasingly broader with (hole) doping, hence resolving and assigning spectral features has proven challenging even with the highest energy resolution experimentally achievable. Here we have overcome this limitation by measuring the complete polarization dependence of the RIXS spectra as function of momentum transfer and doping in thin films of NdBa2Cu3O 7−δ . Besides confirming the previous assignment of dd and spin excitations (magnon, bimagnon) in the antiferromagnetic insulating parent compound, we unequivocally single out the actual spin-flip contribution at all dopings. We also demonstrate that the softening of dd excitations is mainly attributed to the shift of the xy peak to lower energy loss. These results provide a definitive assessment of the RIXS spectra of cuprates and demonstrate that RIXS measurements with full polarization control are practically feasible and highly informative.

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Crystal electric field in CeRh2Si2 studied with high-resolution resonant inelastic soft x-ray scattering

Cited by 23 publications

References 35 publications

Fully gapped s -wave superconductivity enhanced by magnetic criticality in heavy-fermion systems

Fully gapped s -wave superconductivity enhanced by magnetic criticality in heavy-fermion systems

Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh2Si2

Polarization-resolved Cu L3 -edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa2Cu3O7−<

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