Evidence for Weakly Correlated Oxygen Holes in the Highest- Tc Cuprate Superconductor HgBa2Ca2Cu3O8+δ
| Autor: | Daniel Malterre, Bertrand Kierren, Luc Moreau, Yannick Fagot-Revurat, Julien Granet, Masaki Oura, Muriel Sicot, A. Chainani, Yoshinori Tokura, Ayako Yamamoto, Guillaume Vasseur |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Absorption spectroscopy Condensed matter physics Photoemission spectroscopy General Physics and Astronomy 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology 01 natural sciences Metal Crystallography K-edge visual_art 0103 physical sciences visual_art.visual_art_medium Cuprate Singlet state 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Letters. 119 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.119.057001 |
| 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: |
|