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Title: Probing inter- and intrachain Zhang-Rice excitons in Li 2 CuO 2 and determining their binding energy

Cuprate materials, such as those hosting high-temperature superconductivity, represent a famous class of materials where the correlations between the strongly entangled charges and spins produce complex phase diagrams. Several years ago, the Zhang-Rice singlet was proposed as a natural quasiparticle in hole-doped cuprates. The occurrence and binding energy of this quasiparticle, consisting of a pair of bound holes with antiparallel spins on the same CuO 4 plaquette, depends on the local electronic interactions, which are fundamental quantities for understanding the physics of the cuprates. Here, we employ state-of-the-art resonant inelastic x-ray scattering (RIXS) to probe the correlated physics of the CuO 4 plaquettes in the quasi-one-dimensional chain cuprate Li 2CuO 2. By tuning the incoming photon energy to the O K edge, we populate bound states related to the Zhang-Rice quasiparticles in the RIXS process. Both intra- and interchain Zhang-Rice singlets are observed and their occurrence is shown to depend on the nearest-neighbor spin-spin correlations, which are readily probed in this experiment. Finally, we also extract the binding energy of the Zhang-Rice singlet and identify the Zhang-Rice triplet excitation in the RIXS spectra.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [4] ;  [4] ;  [6] ;  [7] ;  [8] ;  [9]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Research Dept. Synchrotron Radiation and Nanotechnology; Univ. of Zurich (Switzerland). Inst. of Physics
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Research Dept. Synchrotron Radiation and Nanotechnology; Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Research Dept. Synchrotron Radiation and Nanotechnology; Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  4. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Research Dept. Synchrotron Radiation and Nanotechnology
  6. Max-Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  7. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Univ. of Tennessee, Knoxville, TN (United States). Joint Inst. for Advanced Materials
  8. Paris Lodron Univ. Salzburg, Salzburg (Austria)
  9. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Research Dept. Synchrotron Radiation and Nanotechnologyv
Publication Date:
Report Number(s):
BNL-113444-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1701544
Grant/Contract Number:
SC00112704; PZ00P2_154867; GE 1647/3-1; 200021L_141325
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1341697