| Autor: |
A, Chainani, M, Sicot, Y, Fagot-Revurat, G, Vasseur, J, Granet, B, Kierren, L, Moreau, M, Oura, A, Yamamoto, Y, Tokura, D, Malterre |
| Rok vydání: |
2016 |
| Zdroj: |
Physical review letters. 119(5) |
| ISSN: |
1079-7114 |
| Popis: |
We study the electronic structure of HgBa_{2}Ca_{2}Cu_{3}O_{8+δ} (Hg1223; T_{c}=134 K) using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). Resonant valence band PES across the O K edge and Cu L edge identifies correlation satellites originating in O 2p and Cu 3d two-hole final states, respectively. Analyses using the experimental O 2p and Cu 3d partial density of states show quantitatively different on-site Coulomb energy for the Cu site (U_{dd}=6.5±0.5 eV) and O site (U_{pp}=1.0±0.5 eV). Cu_{2}O_{7}-cluster calculations with nonlocal screening explain the Cu 2p core level PES and Cu L-edge XAS spectra, confirm the U_{dd} and U_{pp} values, and provide evidence for the Zhang-Rice singlet state in Hg1223. In contrast to other hole-doped cuprates and 3d-transition metal oxides, the present results indicate weakly correlated oxygen holes in Hg1223. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
