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Probing inter- and intrachain Zhang-Rice excitons in Li2CuO2 and determining their binding energy

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Monney Claude, Bisogni Valentina, Zhou Ke-Jin, Kraus Roberto, Strocov Vladimir N., Behr Günter, Drechsler Stefan-Ludwig, Rosner Helge, Johnston Steve, Geck Jochen, Schmitt Thorsten,
Project Coupled spin, charge and orbital dynamics of low-dimensional cuprates
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 94(16)
Page(s) 165118
Title of proceedings Physical Review B
DOI 10.1103/physrevb.94.165118

Open Access

URL https://arxiv.org/abs/1609.08986
Type of Open Access Repository (Green Open Access)

Abstract

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. We also extract the binding energy of the Zhang-Rice singlet and identify the Zhang-Rice triplet excitation in the RIXS spectra.
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