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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

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Starowicz P., Kurleto R., Goraus J., Walczak Ł., Penc B., Adell J., Szlawska M., Kaczorowski D., Szytuła A.

Acta Physica Polonica A

2014

vol. 126

issue 4a

A-144-A-148

This work presents studies of the valence band of two Kondo lattice systems: Ce_2Co_{0.8}Si_{3.2}, which is paramagnetic with the Kondo temperature T_{K} ≈50 K and Ce_2RhSi_3, which is antiferromagnetic below T_{N}=4.5 K and exhibits T_{K} ≈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 (E_{F}), its spin-orbit splitting partner at 0.24 eV and a broad maximum related to Ce f^0 final state. The spectra indicate that Kondo peak has a higher intensity for Ce_2Co_{0.8}Si_{3.2}. The off-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards E_{F} for Ce_2Co_{0.8}Si_{3.2} as compared to Ce_2RhSi_3. 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 E_{F} is observed for Ce_2CoSi_3. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of Ce_2RhSi_3 and Ce_2CoSi_3, respectively.

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1 Acta Physica Polonica A

1 2014

1 Adell J.

1 Goraus J.

1 Kaczorowski D.

1 Kurleto R.

1 Penc B.

1 Starowicz P.

1 Szlawska M.

1 Szytuła A.

1 Walczak Ł.

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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