Download file (2.02MB)
Download as zip (1.73MB)

コレクション

引用

説明:

We study the electronic structure of electron-doped Pr1.3−x La0.7 Cex CuO4 (PLCCO; Tc = 27 K, x = 0.1) and hole-doped Bi2Sr2CaCu2O8+δ (Bi2212; Tc = 90K) cuprate superconductors using x-ray absorption spec- troscopy and resonant photoemission spectroscopy (Res-PES). From Res-PES across the O K-edge and Cu L-edge, we identify the O 2p and Cu 3d partial density of states (PDOS) and their correlation satellites, which originate in two-hole Auger final states. Using the Cini-Sawatzky method, analysis of the experimental O 2p PDOS shows an oxygen on-site Coulomb energy for PLCCO to be Up = 3.3 ± 0.5 eV, and for Bi2212, Up = 5.6 ± 0.5 eV, while the copper on-site Coulomb correlation energy is Ud = 6.5 ± 0.5 eV for Bi2212. The expression for the Heisenberg exchange interaction J in terms of the electronic parameters Ud, Up, charge-transfer energy 􏰀, and Cu-O hopping tpd obtained from a simple Cu2O cluster model is used to carry out an optimization analysis consistent with J known from scattering experiments. The analysis also provides the effective one-band on-site Coulomb correlation energy U ̃ and the effective hopping t ̃. PLCCO and Bi2212 are shown to exhibit very similar values of U ̃ /t ̃ ∼ 9–10, confirming the strongly correlated nature of the singlet ground state in the effective one-band model for both materials.

権利情報:

• In Copyright
  

キーワード: electronic structure, X-ray absorption spectroscopy, resonant photoemission spectroscopy, high-Tc superconductor

刊行年月日: 2023-05-30

出版者: American Physical Society (APS)

掲載誌:

• PHYSICAL REVIEW B (ISSN: 24699950) vol. 107 issue. 19 p. 1-12

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/PhysRevB.107.195152

関連資料:

その他の識別子:

連絡先:

更新時刻: 2024-03-21 12:30:25 +0900

MDRでの公開時刻: 2024-03-21 12:30:25 +0900