Detection of a two-phonon mode in a cuprate superconductor via polarimetric resonant inelastic x-ray scattering
K. Scott, E. Kisiel, F. Yakhou, S. Agrestini, M. Garcia-Fernandez, K. Kummer, J. Choi, R. D. Zhong, J. A. Schneeloch, G. D. Gu, Ke-Jin Zhou, N. B. Brookes, A. F. Kemper, M. Minola, F. Boschini, A. Frano, A. Gozar, E. H. da Silva Neto
DOI 10.1103/PhysRevB.109.125126 · Physical Review B
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Abstract
Recent improvements in the energy resolution of resonant inelastic x-ray scattering experiments (RIXS) at the Cu-L3 edge have enabled the study of lattice, spin, and charge excitations. Here, we report on the detection of a low-intensity signal at 140 meV, twice the energy of the bond-stretching (BS) phonon mode, in the cuprate superconductor Bi2Sr2CaCu2O8+x (Bi-2212). Ultrahigh-resolution polarimetric RIXS measurements allow us to resolve the outgoing polarization of the signal and identify this feature as a two-phonon excitation. Further, we study the connection between the two-phonon mode and the BS one-phonon mode by constructing a joint density of states toy model that reproduces the key features of the data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 54 | Pressure not reported | unknown |
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