Evidence of momentum-dependent hybridization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Ce</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mn>0.8</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>3.2</mml:mn></mml:msub></mml:math>

Starowicz, P.; Kurleto, R.; Goraus, Jerzy; Schwab, H.; Szlawska, Maria; Förster, Frank; Szytuła, A.; Vobornik, I.; Kaczorowski, D.; Reinert, F.

doi:10.1103/physrevb.89.115122

Cited by 9 publications

(8 citation statements)

References 31 publications

(29 reference statements)

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“…It is observed in the o-resonance spectra that for Ce 2 Co 0.8 Si 3.2 the maximum in density of states (DOS) is closer to E F than in the case of Ce 2 RhSi 3 . The present results of resonant photoemission are in qualitative agreement with the recent ARPES studies carried out for Ce 2 Co 0.8 Si 3.2 [10]. Previously, the f 1 5/2 and f 1 7/2 peaks were found to be nondispersive.…”

Section: Methodssupporting

confidence: 93%

“…It appears that the Kondo resonance has higher intensity for Ce 2 CoSi 3 when compared to Ce 2 RhSi 3 system with coexisting magnetic order and Kondo interaction [9]. Recently, a momentum dependence of the Kondo peak was established in Ce 2 Co 0.8 Si 3.2 by means of angle-resolved photoemission spectroscopy (ARPES) [10]. This nding was interpreted as the evidence of a strong momentum dependence of the hybridization between conduction band and 4f electrons.…”

Section: Introductionmentioning

confidence: 99%

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Valence Band of Ce_2Co_{0.8}Si_{3.2} and Ce_2RhSi_3 Studied by Resonant Photoemission Spectroscopy and FPLO Calculations

et al. 2014

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This work presents studies of the valence band of two Kondo lattice systems: Ce2Co0.8Si3.2, which is paramagnetic with the Kondo temperature TK ≈ 50 K and Ce2RhSi3, which is antiferromagnetic below TN = 4.5 K and exhibits TK ≈ 9 K. The photoemission spectra, which are obtained with photon energy tuned to Ce 4d 4f resonance, reveal a Kondo peak at the Fermi energy (EF), its spinorbit splitting partner at 0.24 eV and a broad maximum related to Ce f 0 nal state. The spectra indicate that Kondo peak has a higher intensity for Ce2Co0.8Si3.2. The o-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards EF for Ce2Co0.8Si3.2 as compared to Ce2RhSi3. Full-potential local-orbital calculations were realized with local spin density approach +U approach for 213 stoichiometry. They show that a higher density of states near EF is observed for Ce2CoSi3. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of Ce2RhSi3 and Ce2CoSi3, respectively.

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Section: Methodssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Valence Band of Ce_2Co_{0.8}Si_{3.2} and Ce_2RhSi_3 Studied by Resonant Photoemission Spectroscopy and FPLO Calculations

et al. 2014

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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: 82%

“…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]. Therefore, we interpret the difference between He II and He I spectra as originating from Ce 4f electrons (Fig.…”

Section: Valence Band Photoemission Spectramentioning

confidence: 98%

“…However, we do not favor such a hypothesis, as a very low value of T K (much below 14 K) is not in agreement with the valence fluctuation scenario in CeNi 9 In 2 . A broad peak in the region of -2.3 eV of the difference spectrum may be attributed to the f 0 final state [22,26]. UPS studies were conducted in a series of temperatures between T=14 K and room temperature but no clear differences have been found.…”

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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Kondo lattice behavior observed in the CeCu9In2 compound

Kurleto

Szytuła

Goraus

et al. 2019

Journal of Alloys and Compounds

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We report systematic studies of CeCu 9 In 2 , which appears to be a new Kondo lattice system. Electrical resistivity exhibits a logarithmic law characteristic of Kondo systems with a broad maximum at T coh ≈45 K and it obeys the Fermi liquid theory at low temperature. Specific heat of CeCu 9 In 2 is well described by the Einstein and Debye models with electronic part at high temperature. Fitting of the Schottky formula to low temperature 4f contribution to specific heat yielded crystal field splitting of 50.2 K between a doublet and quasi-quartet. The Schotte-Schotte model estimates roughly Kondo temperature as T K ≈5 K, but does not reproduce well the data due to a sharp peak at 1.6 K. This structure should be attributed to a phase transition, a nature of which is possibly antiferromagnetic. Specific heat is characterized with increased Sommerfeld coefficient estimated as γ ≈132 mJ/(mole·K 2 ). Spectra of the valence band, which have been collected with ultraviolet photoelectron spectroscopy (UPS), show a peak at binding energy≈250 meV, which originates from the Ce 4f electrons and is related to the 4f 1 7/2 final state. Extracted 4f contribution to the spectral function exhibits also the enhancement of intensity in the vicinity of the Fermi level. Satellite structure of the Ce 3d levels spectra measured by X-ray photoelectron spectroscopy (XPS) has been analyzed within the framework of the Gunnarsson-Schönhammer theory. Theoretical calculations based on density functional theory (FPLO method with LDA+U approach) delivered densities of states, band structures and Fermi surfaces for CeCu 9 In 2 and LaCu 9 In 2 . The results indicate that Fermi surface nesting takes place in CeCu 9 In 2 .

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Evidence of momentum-dependent hybridization inCe2Co0.8Si3.2

Cited by 9 publications

References 31 publications

Valence Band of Ce_2Co_{0.8}Si_{3.2} and Ce_2RhSi_3 Studied by Resonant Photoemission Spectroscopy and FPLO Calculations

Valence Band of Ce_2Co_{0.8}Si_{3.2} and Ce_2RhSi_3 Studied by Resonant Photoemission Spectroscopy and FPLO Calculations

Electronic structure and transport properties of CeNi9In2

Kondo lattice behavior observed in the CeCu9In2 compound

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