We report a photoemission and x-ray absorption study on a Au1-xPtxTe2 (x = 0 and 0.35) triangular lattice in which superconductivity is induced by Pt substitution for Au. Au 4f and Te 3d core-level spectra of AuTe2 suggest a valence state of Au2+(Te-2)(2-), which is consistent with its distorted crystal structure with Te-Te dimers and compressed AuTe6 octahedra. On the other hand, valence-band photoemission spectra and preedge peaks of the Te 3d absorption edge indicate that Au 5d bands are almost fully occupied and that Te 5p holes govern the transport properties and the lattice distortion. The two apparently conflicting pictures can be reconciled by strong Au 5d/Au 6s-Te 5p hybridization. The absence of a core-level energy shift with Pt substitution is inconsistent with the simple rigid band picture for hole doping. The Au 4f core-level spectrum gets slightly narrow with Pt substitution, indicating that the small Au 5d charge modulation in distorted AuTe2 is partially suppressed.

Effect of Pt substitution on the electronic structure ofAuTe2 / D., Ootsuki; K., Takubo; K., Kudo; H., Ishii; M., Nohara; Saini, Naurang Lal; R., Sutarto; F., He; T. Z., Regier; M., Zonno; M., Schneider; G., Levy; G. A., Sawatzky; A., Damascelli; T., Mizokawa. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 90:(2014). [10.1103/PhysRevB.90.144515]

Effect of Pt substitution on the electronic structure ofAuTe2

SAINI, Naurang Lal;
2014

Abstract

We report a photoemission and x-ray absorption study on a Au1-xPtxTe2 (x = 0 and 0.35) triangular lattice in which superconductivity is induced by Pt substitution for Au. Au 4f and Te 3d core-level spectra of AuTe2 suggest a valence state of Au2+(Te-2)(2-), which is consistent with its distorted crystal structure with Te-Te dimers and compressed AuTe6 octahedra. On the other hand, valence-band photoemission spectra and preedge peaks of the Te 3d absorption edge indicate that Au 5d bands are almost fully occupied and that Te 5p holes govern the transport properties and the lattice distortion. The two apparently conflicting pictures can be reconciled by strong Au 5d/Au 6s-Te 5p hybridization. The absence of a core-level energy shift with Pt substitution is inconsistent with the simple rigid band picture for hole doping. The Au 4f core-level spectrum gets slightly narrow with Pt substitution, indicating that the small Au 5d charge modulation in distorted AuTe2 is partially suppressed.
2014
01 Pubblicazione su rivista::01a Articolo in rivista
Effect of Pt substitution on the electronic structure ofAuTe2 / D., Ootsuki; K., Takubo; K., Kudo; H., Ishii; M., Nohara; Saini, Naurang Lal; R., Sutarto; F., He; T. Z., Regier; M., Zonno; M., Schneider; G., Levy; G. A., Sawatzky; A., Damascelli; T., Mizokawa. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 90:(2014). [10.1103/PhysRevB.90.144515]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/778023
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