Bulk electronic structure of non-centrosymmetric EuTGe3 (T=Co, Ni, Rh, Ir) studied by hard x-ray photoelectron spectroscopy

Utsumi, Yuki; Kasinathan, Deepa; Swatek, Przemys?aw; Bednarchuk, Oleksandr; Kaczorowski, Dariusz; Ablett, James M.; Rueff, Jean-Pascal

doi:10.1103/PhysRevB.97.115155

Title: Bulk electronic structure of non-centrosymmetric EuTGe₃ (T=Co, Ni, Rh, Ir) studied by hard x-ray photoelectron spectroscopy

Journal Article · Thu Mar 15 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.115155· OSTI ID:1433664

Utsumi, Yuki ^[1]; Kasinathan, Deepa ^[2]; Swatek, Przemys?aw ^[3]; Bednarchuk, Oleksandr ^[4]; Kaczorowski, Dariusz ^[5]; Ablett, James M. ^[1]; Rueff, Jean-Pascal ^[6]

Synchrotron SOLEIL, Gif sur Yvette (France)
Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Polish Academy of Sciences (PAS), Warsaw (Poland). Inst. of Low Temperature and Structure Research
Polish Academy of Sciences (PAS), Warsaw (Poland). Inst. of Low Temperature and Structure Research
Polish Academy of Sciences (PAS), Warsaw (Poland). Inst. of Low Temperature and Structure Research
Synchrotron SOLEIL, Gif sur Yvette (France); Univ. Pierre et Marie Curie, Paris (France). Laboratoire de Chimie Physique-Matiere et Rayonnement

Non-centrosymmetric EuTGe₃ ( T = Co, Ni, Rh, and Ir) possesses magnetic Eu²⁺ ions, and antiferromagnetic ordering appears at low temperatures. Transition-metal substitution leads to changes in the unit-cell volume and in the magnetic ordering. However, the magnetic ordering temperature does not scale with the volume change, and the Eu valence is expected to remain divalent. Here we study the bulk electronic structure of non-centrosymmetric Eu T Ge₃ ( T = Co, Ni, Rh, and Ir) by hard x-ray photoelectron spectroscopy. The Eu 3d core-level spectrum confirms the robust Eu²⁺ valence state against the transition-metal substitution with a small contribution from Eu³⁺ . The estimated Eu mean valence is around 2.1 in these compounds, as confirmed by multiplet calculations. In contrast, the Ge 2p spectrum shifts to higher binding energy upon cha nging the transition metal from 3d to 4d to 5d elements, hinting at a change in the Ge- T bonding strength. The valence bands of the different compounds are found to be well reproduced by ab initio band structure calculations.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1433664

Alternate ID(s):: OSTI ID: 1429575

Report Number(s):: IS-J-9618; PRBMDO; TRN: US1802539

Journal Information:: Physical Review B, Vol. 97, Issue 11; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Title: Bulk electronic structure of non-centrosymmetric EuTGe3 (T=Co, Ni, Rh, Ir) studied by hard x-ray photoelectron spectroscopy

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