Doping Dependence of 2-Spinon Excitations in the Doped 1D Cuprate Ba2CuO3+δ
Jiarui Li, Daniel Jost, Ta Tang, Ruohan Wang, Yong Zhong, Zhuoyu Chen, Mirian Garcia-Fernandez, Jonathan Pelliciari, Valentina Bisogni, Brian Moritz, Kejin Zhou, Yao Wang, Thomas P. Devereaux, Wei-Sheng Lee, Zhi-Xun Shen
DOI 10.1103/PhysRevLett.134.146501 · Physical Review Letters
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Abstract
Recent photoemission experiments on the quasi-one-dimensional Ba-based cuprates suggest that doped holes experience an attractive potential not captured using the simple Hubbard model. This observation has garnered significant attention due to its potential relevance to Cooper pair formation in high-Tc cuprate superconductors. To scrutinize this assertion, we examined signatures of such an attractive potential in doped 1D cuprates Ba2CuO3+δ by measuring the dispersion of the 2-spinon excitations using Cu L3-edge resonant inelastic x-ray scattering (RIXS). Upon doping, the 2-spinon excitations appear to weaken, with a shift of the minimal position corresponding to the nesting vector of the Fermi points, qF. Notably, we find that the energy scale of the 2-spinons near the Brillouin zone boundary is substantially softened compared to that predicted by the Hubbard model in one dimension. Such a discrepancy implies missing ingredients, which lends support for the presence of an additional attractive potential between holes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2CuO3+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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