Electronic States of an Antiferromagnet CeCuSb<sub>2</sub> Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

Abozeed, Amina A.; Sano, Katsuhiro; Terashima, Kazuhiko; Yamasaki, Akira; Higashiya, A.; Fujiwara, H.; Sekiyama, A.; Tanaka, Yoshihito; Yabashi, Makina; Tamasaku, Kenji; Ishikawa, Tetsuya; Masubuchi, Satoru; Imada, S.

doi:10.7566/jpscp.30.011104

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019) 2020

DOI: 10.7566/jpscp.30.011104

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Electronic States of an Antiferromagnet CeCuSb₂ Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

Amina A. Abozeed

Katsuhiro Sano

Kazuhiko Terashima

et al.

Abstract: Band structure calculations were performed on the dense Kondo antiferromagnetic CeCuSb 2 and revealed that the essential contribution to the total density of state (DOS) around E F originates from Sb 5p-Ce 5d bands while the contribution of Ce 4f band is rather small. Polarization-dependence of CeCuSb 2 valence band HAXPES spectra was successfully observed. The experimental HAXPES results were described fairly well by the band structure calculations where the photoionization dependent cross section was taken i… Show more

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Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs₂

Datta

Pandeya

Dey

et al. 2023

J. Phys.: Condens. Matter

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We investigate the electronic structure of an antiferromagnetic Kondo lattice system CeAgAs2 employing hard x-ray photoemission spectroscopy. CeAgAs2, an orthorhombic variant of HfCuSi2 structure, exhibits antiferromagnetic ground state, Kondo like resistivity upturn and compensation of magnetic moments at low temperatures. The photoemission spectra obtained at different photon energies suggest termination of the cleaved surface at cis-trans-As layers. The depth-resolved data show significant surface-bulk differences in the As and Ce core level spectra. The As 2p bulk spectrum shows distinct two peaks corresponding to two different As layers. The peak at higher binding energy correspond to cis-trans-As layers and is weakly hybridized with the adjacent Ce layers. The As layers between Ce and Ag-layers possess close to trivalent configuration due to strong hybridization with the neighboring atoms and the corresponding feature appear at lower binding energy. Ce 3d core level spectra show multiple features reflecting strong Ce-As hybridization and strong correlation. Intense f0 peak is observed in the surface spectrum while it is insignificant in the bulk. In addition, we observe a features at binding energy lower than the well-screened feature indicating the presence of additional interactions. This feature becomes more intense in the bulk spectra suggesting it to be a bulk property. Increase in temperature leads to a spectral weight transfer to higher binding energies in the core level spectra and a depletion of spectral intensity at the Fermi level as expected in a Kondo material. These results reveal interesting surface-bulk differences, complex interplay of intra- and inter-layer covalency, and electron correlation in the electronic structure of this novel Kondo lattice system.

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Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs₂

Datta

Pandeya

Dey

et al. 2023

J. Phys.: Condens. Matter

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Giant spectral renormalization and complex hybridization physics in the Kondo lattice system CeCuSb2

et al. 2022

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We investigate the electronic structure of a Kondo lattice system, CeCuSb 2 exhibiting significant mass enhancement and Kondo-type behavior. We observe multiple features in the hard x-ray photoemission spectra of Ce core levels due to strong final-state effects. The depth-resolved data exhibit a significant change in relative intensity of the features with the surface sensitivity of the probe. The extracted surface and bulk spectral functions are different and exhibit a Kondo-like feature at higher binding energies in addition to the well and poorly screened features. The core-level spectra of Sb exhibit huge and complex changes as a function of the surface sensitivity of the technique. The analysis of the experimental data suggests that the two nonequivalent Sb sites possess different electronic structures and in each category, the Sb layers close to the surface are different from the bulk ones. An increase in temperature influences the Ce-Sb hybridization significantly. The plasmon-excitation-induced loss features are also observed in all core-level spectra. All these results reveal the importance of Ce-Sb hybridizations and indicate that the complex renormalization of Ce-Sb hybridization may be the reason for the exotic electronic properties of this system.

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Electronic States of an Antiferromagnet CeCuSb₂ Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

Cited by 2 publications

References 25 publications

Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs₂

Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs₂

Giant spectral renormalization and complex hybridization physics in the Kondo lattice system CeCuSb2

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Electronic States of an Antiferromagnet CeCuSb2 Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

Cited by 2 publications

References 25 publications

Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs2

Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs2

Giant spectral renormalization and complex hybridization physics in the Kondo lattice system CeCuSb2

Contact Info

Product

Resources

About

Electronic States of an Antiferromagnet CeCuSb₂ Studied by Linearly Polarized Hard X-Ray Photoemission Spectroscopy

Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs₂

Layer-resolved electronic behavior in a Kondo lattice system, CeAgAs₂