Recent developments in high-energy spectroscopies of Kondo systems

Malterre, D.; Grioni, M.; Baer, Y.

doi:10.1080/00018739600101507

Cited by 162 publications

(122 citation statements)

References 111 publications

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“…The difference resembles a typical spectral function obtained from the single impurity Anderson model for a Kondo system [25] but does not show sharp peaks. A high intensity near E F should accommodate both a f 1 5/2 peak observed at E F and a spin orbit partner f 1 7/2 located in the region of ∼ -0.28 meV [22,26]. Despite a very high energy resolution of our UPS study the peaks f 1 5/2 and f 1 7/2 are not resolved but form a broad maximum or rather a plateau between 0.3 eV and E F .…”

Section: Valence Band Photoemission Spectramentioning

confidence: 83%

“…The low energy peak for He II is broader and has increased spectral weight in a vicinity of E F . This can originate from Ce f electrons, which very often contribute to a spectrum near E F with the f 1 final state [22]. It was proved both theoretically [24] and experimentally [22,25] that Ce 4f electrons exhibit a higher photoionization cross section for He II radiation when compared to He I.…”

Section: Valence Band Photoemission Spectramentioning

confidence: 99%

“…This can originate from Ce f electrons, which very often contribute to a spectrum near E F with the f 1 final state [22]. It was proved both theoretically [24] and experimentally [22,25] that Ce 4f electrons exhibit a higher photoionization cross section for He II radiation when compared to He I. The theoretical cross section is 3.25 times higher for He II [24] but the real increase of this factor according to the experiment may be much larger as in many cases a sharp and intensive Kondo peak is observed near the photon energy hν= 40 eV, while it vanishes at hν = 20 to 25 eV [22,25,26].…”

Section: Valence Band Photoemission Spectramentioning

confidence: 99%

“…Manifestations of a Kondo effect and heavy fermion physics may be visible in electronic structure, especially around E F [22,23]. So as to examine how many body interactions impact on density of states we collected photoemission spectra (UPS) of the valence band.…”

Section: Valence Band Photoemission Spectramentioning

confidence: 99%

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Electronic structure and transport properties of CeNi9In2

Kurleto

Starowicz

Goraus

et al. 2015

Solid State Communications

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We investigated CeNi 9 In 2 compound, which has been considered as a mixed valence (MV) system. Electrical resistivity vs. temperature variation was analysed in terms of the model proposed by Freimuth for systems with unstable 4f shell. At low temperature the resistivity dependence is consistent with a Fermi liquid state with a contribution characteristic of electron-phonon interaction. Ultraviolet photoemission spectroscopy (UPS) studies of the valence band did not reveal a Kondo peak down to 14 K. A difference of the spectra obtained with photon energies of low and high photoionization cross sections for Ce 4f electrons indicated that 4f states are located mainly close to the Fermi energy. The peaks related to f 5/2 1 and f 7/2 1 final states cannot be resolved but form a plateau between -0.3 eV and the Fermi energy. X-ray photoemission spectroscopy (XPS) studies were realized for the cerium 3d level. The analysis of XPS spectra within the Gunnarsson-Shönhammer theory yielded a hybridization parameter of 104 meV and non-integer f level occupation, being close to 3. Calculations of partial densities of states were realized by a full potential local orbital (FPLO) method. They confirm that the valence band is dominated by Ni 3d states and are in general agreement with the experiment except for the behavior of f-electrons.

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Section: Valence Band Photoemission Spectramentioning

confidence: 83%

Section: Valence Band Photoemission Spectramentioning

confidence: 99%

Section: Valence Band Photoemission Spectramentioning

confidence: 99%

Section: Valence Band Photoemission Spectramentioning

confidence: 99%

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Electronic structure and transport properties of CeNi9In2

Kurleto

Starowicz

Goraus

et al. 2015

Solid State Communications

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“…6(a). In the single impurity model picture 42 , the three-peaked structure at resonance is associated with 4f 1 5/2 , 4f 1 7/2 and 4f 0 final states. The spectral weight of the 4f 1 7/2 peak around 0.2 eV is almost the same as that of the 4f 1 5/2 peak in the vicinity of the Fermi level (E F ), which is typical of γ-like low T K Ce compounds 43 .…”

Section: B Soft X-ray Angle-resolved Photoemission Spectroscopymentioning

confidence: 99%

Electronic Structures of Ferromagnetic CeAgSb₂: Soft X-ray Absorption, Magnetic Circular Dichroism, and Angle-Resolved Photoemission Spectroscopies

et al. 2016

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We report a combined study for the electronic structures of ferromagnetic CeAgSb2 using soft X-ray absorption (XAS), magnetic circular dichroism (XMCD), and angle-resolved photoemission (ARPES) spectroscopies. The Ce M4,5 XAS spectra show very small satellite structures, reflecting a strongly localized character of the Ce 4f electrons. The linear dichroism effects in the Ce M4,5 XAS spectra demonstrate the ground state Ce 4f symmetry of Γ6, the spatial distribution of which is directed along the c-axis. The XMCD results give support to the picture of local-moment magnetism in CeAgSb2. Moreover it is also found that the theoretical band dispersions for LaAgSb2 provides better description of the ARPES band structures than those for CeAgSb2. Nevertheless, ARPES spectra at the Ce 3d-4f resonance show the momentum dependence for the intensity ratio between Ce 4f 1 5/2 and 4f 1 7/2 peaks in a part of the Brillouin zone, suggesting the non-negligible momentum dependent hybridization effect between the Ce 4f and the conduction electrons. This is associated with the moderate mass enhancement in CeAgSb2.

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Ferromagnetism within the Periodic Anderson Model: A New Approximation Scheme

Meyer¹,

Nolting²,

Reddy³

et al. 1998

phys. stat. sol. (b)

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We introduce a new approach to the periodic Anderson model (PAM) that allows a detailed investigation of the magnetic properties in the Kondo as well as the intermediate valence regime. Our method is based on an exact mapping of the PAM onto an effective medium strong-coupling Hubbard model. For the latter, the so-called spectral density approach (SDA) is rather well motivated since it is based on exact results in the strong coupling limit. Besides the T 0 phase diagram, magnetization curves and Curie temperatures are presented and discussed with help of temperature-dependent quasiparticle densities of state. In the intermediate valence regime, the hybridization gap plays a major role in determining the magnetic behaviour. Furthermore, our results indicate that ferromagnetism in this parameter regime is not induced by an effective spin±spin interaction between the localized levels mediated by conduction electrons as it is the case in the Kondo regime. The magnetic ordering is rather a single-band effect within an effective f-band.

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Recent developments in high-energy spectroscopies of Kondo systems

Cited by 162 publications

References 111 publications

Electronic structure and transport properties of CeNi9In2

Electronic structure and transport properties of CeNi9In2

Electronic Structures of Ferromagnetic CeAgSb₂: Soft X-ray Absorption, Magnetic Circular Dichroism, and Angle-Resolved Photoemission Spectroscopies

Ferromagnetism within the Periodic Anderson Model: A New Approximation Scheme

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Recent developments in high-energy spectroscopies of Kondo systems

Cited by 162 publications

References 111 publications

Electronic structure and transport properties of CeNi9In2

Electronic structure and transport properties of CeNi9In2

Electronic Structures of Ferromagnetic CeAgSb2: Soft X-ray Absorption, Magnetic Circular Dichroism, and Angle-Resolved Photoemission Spectroscopies

Ferromagnetism within the Periodic Anderson Model: A New Approximation Scheme

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Product

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Electronic Structures of Ferromagnetic CeAgSb₂: Soft X-ray Absorption, Magnetic Circular Dichroism, and Angle-Resolved Photoemission Spectroscopies