Acoustic plasmons and conducting carriers in hole-doped cuprate superconductors
Journal Article
·
· Physical Review. B
- National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- National Tsing Hua Univ., Hsinchu (Taiwan)
- Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa (Japan)
- Northeastern University, Boston, MA (United States)
- Academia Sinica, Taipei (Taiwan); Sun Yat-Sen Univ., Kaohsiung (Taiwan)
- Waseda Univ., Shinjuku (Japan); National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
- National Synchrotron Radiation Research Center, Hsinchu (Taiwan); National Tsing Hua Univ., Hsinchu (Taiwan)
The layered crystal structures of cuprates enable collective charge excitations fundamentally different from those of three-dimensional metals. Acoustic plasmons have been observed in electron-doped cuprates by resonant inelastic X-ray scattering (RIXS); in contrast, whether acoustic plasmons exist in hole-doped cuprates is under debate, despite extensive measurements. This contrast led us to investigate the charge excitations of hole-doped cuprate La2-xSrxCuO4. Here we present incidentenergy-dependent RIXS measurements and calculations of collective charge response via the loss function to reconcile the aforementioned issues. Our results provide evidence for the acoustic plasmons of Zhang-Rice singlet (ZRS), which has a character of the Cu 3dx2-y2 strongly hybridised with the O 2p orbitals; the metallic behaviour is implied to result from the movement of ZRS rather than the simple hopping of O 2p holes.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- Japan Society for the Promotion of Science; Ministry of Science and Technology of Taiwan; USDOE Office of Science (SC). Basic Energy Sciences (BES)
- Grant/Contract Number:
- 89233218CNA000001; FG02-07ER46352
- OSTI ID:
- 1873327
- Report Number(s):
- LA-UR-20-22849
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 23 Vol. 105; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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