Electron-lattice interactions strongly renormalize the charge-transfer energy in the spin-chain cuprate Li2CuO2
- Univ. of Tennessee, Knoxville, TN (United States)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. of Zurich (Switzerland)
- Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
- Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic). Inst. of Physics
- Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Dresden Univ. of Technology (Germany)
Strongly correlated insulators are broadly divided into two classes: Mott–Hubbard insulators, where the insulating gap is driven by the Coulomb repulsion U on the transition-metal cation, and charge-transfer insulators, where the gap is driven by the charge-transfer energy Δ between the cation and the ligand anions. The relative magnitudes of U and Δ determine which class a material belongs to, and subsequently the nature of its low-energy excitations. These energy scales are typically understood through the local chemistry of the active ions. Here we show that the situation is more complex in the low-dimensional charge-transfer insulator Li2CuO2, where Δ has a large non-electronic component. Combining resonant inelastic X-ray scattering with detailed modelling, we determine how the elementary lattice, charge, spin and orbital excitations are entangled in this material. Finally, this results in a large lattice-driven renormalization of Δ, which significantly reshapes the fundamental electronic properties of Li2CuO2.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; 200021L 141325; GE 1647/3-1; PZ00P2 154867; GE1647/2-1
- OSTI ID:
- 1258649
- Alternate ID(s):
- OSTI ID: 1340389
- Report Number(s):
- BNL-112581-2016-JA; ncomms10563
- Journal Information:
- Nature Communications, Vol. 7; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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