Effect of Pt substitution on the electronic structure of AuTe2

D. Ootsuki, K. Takubo, K. Kudo, H. Ishii, M. Nohara, N. L. Saini, R. Sutarto, F. He, T. Z. Regier, M. Zonno, M. Schneider, G. Levy, G. A. Sawatzky, A. Damascelli, and T. Mizokawa
Phys. Rev. B 90, 144515 – Published 27 October 2014

Abstract

We report a photoemission and x-ray absorption study on a Au1xPtxTe2 (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+(Te2)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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 1 July 2014
  • Revised 9 October 2014

DOI:https://doi.org/10.1103/PhysRevB.90.144515

©2014 American Physical Society

Authors & Affiliations

D. Ootsuki1, K. Takubo2,3,4, K. Kudo5, H. Ishii5, M. Nohara5, N. L. Saini6, R. Sutarto7, F. He7, T. Z. Regier7, M. Zonno2, M. Schneider2, G. Levy2,3, G. A. Sawatzky2,3, A. Damascelli2,3, and T. Mizokawa1,6

  • 1Department of Physics & Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8561, Japan
  • 2Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
  • 3Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
  • 4Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 5Department of Physics, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
  • 6Department of Physics, University of Rome “La Sapienza,” 00185 Rome, Italy
  • 7Canadian Light Source, Saskatoon, Saskatchewan, Canada S7N 2V3

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 90, Iss. 14 — 1 October 2014

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×