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

Journal Article · · Physical Review B
 [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
+ Show Author Affiliations

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 CuO4 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 CuO4 plaquettes in the quasi-one-dimensional chain cuprate Li2CuO2. 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1341697
Report Number(s):
BNL--113444-2017-JA
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 16 Vol. 94; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Signatures of a magnetic field-induced unconventional nematic liquid in the frustrated and anisotropic spin-chain cuprate LiCuSbO4 journal July 2017
Charge-Spin Correlation in van der Waals Antiferromagnet NiPS 3 journal March 2018
Signatures of a magnetic field-induced unconventional nematic liquid in the frustrated and anisotropic spin-chain cuprate LiCuSbO4 other January 2017

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