0428同步年報-2021-全

010 ACTIVITY REPORT 2021 about the existence of a QCP. In contrast, on suppressing superconductivity in high magnetic fields, linear scalings in resistivity were observed in a more extended regime about the putative QCP near doping level 0.2. While the extended linear-resistivity region showed quantum scaling in temperature, it did not exhibit the quantum-critical scaling in the non-thermal parameter, doping. The correspondence between quantum criticality and T -linear resistivity might thus not be of necessity. The apparent extended critical region that is overlapped with the putative QCP might just be a non-Fermi-liquid phase. In this scenario, the CDW phase becomes a non-Fermi-liquid phase as the doping level is tuned across the putative QCP. In conclusion, they observed short-range CDW in LSCO near the optimal doping over a wide temperature range; these orders compete locally with the superconducting order. Through combining high-resolution RIXS measurements, theoretical modeling and diagrammatic calculations, their results provide evidence for phonon softening in superconducting cuprates induced by charge order. The observation of phonon softening indeed results from quantum fluctuations of the charge order. (Reported by Cheng-Maw Cheng) This report features the work of Atsushi Fujimori, Chien-Te Chen, Di-Jing Huang and their teams and their collaborators published in Phys. Rev. X 11 , 041038 (2021). TPS 41A Soft X-ray Scattering • RIXS, Coherent Scattering, CDI, Ptychography • Materials Science, Condensed-matter Physics Reference 1. H. Y. Huang, A. Singh, C. Y. Mou, S. Johnston, A. F. Kem- per, J. van den Brink, P. J. Chen, T. K. Lee, J. Okamoto, Y. Y. Chu, J. H. Li, S. Komiya, A. C. Komarek, A. Fujimori, C. T. Chen, D. J. Huang, Phys. Rev. X 11 , 041038 (2021). Fig. 1 : Temperature-dependent O K-edge RIXS of optimally doped LSCO. (a) RIXS intensity distribution maps in the plane of energy loss vs in-plane momentum transfer q || along (π, 0) at varied temperature T. (b) RIXS intensity distribution maps after subtraction of elastic scattering. All RIXS spectra are recorded with σ-polarized incident X-rays of energy tuned to the ZRS hole. [Reproduced from Ref. 1]