标题： 层间电子-电子关联与电子-声子耦合相变过程的动力学在三重层镍氧化物La4Ni3O10中 显示英文标题

标题： Dynamics of electron-electron correlated to electron-phonon coupled phase progression in trilayer nickelate La4Ni3O10

摘要： 三层镍酸盐是一类表现出多种相关现象的材料，包括超导性、密度波转变、非费米液体行为以及在T* ~ 150 K附近的不寻常的金属到金属转变。理解电子相关性、晶格和电荷动力学对于揭示镍酸盐中超导性和其他不稳定性的原因至关重要。 我们的深入拉曼测量显示，三层镍酸盐La4Ni3O10在电荷密度波转变附近T*以下，从电子-声子耦合相转变为电子-电子相关相，并估计能量间隙约为18-20 meV。 T*附近的转变还伴随着区域折叠声子模式的出现，反映了进入电荷密度波相的转变。 声子模式的自能参数在T*附近显示出异常变化，这归因于电子-电子相关性，在电荷有序相中声子模式的重整化率比T*以上的相要慢得多。 T*附近的转变以电子-声子耦合参数减少约70%为标志，通过低频拉曼响应估计，准粒子动力学从非费米液体行为转变为朗道费米液体类型的行为。 显示英文摘要

摘要： Trilayer nickelates are a rich class of materials exhibiting diverse correlated phenomena, including superconductivity, density wave transitions, non-Fermi liquid behavior along with an unusual metal-to-metal transition around T* ~ 150 K. Understanding the electronic correlations, lattice and charge dynamics are crucial to unreveal the origin of superconductivity and other instabilities in nickelates. Our in-depth Raman measurements shows that trilayer nickelate, La4Ni3O10, shows transition from electron-phonon coupled phase to the electron-electron correlated one below charge density wave transition around T* with an estimated energy gap of ~ 18-20 meV. The transition around T* is also accompanied by the emergence of zone folded phonon modes reflecting the transition into the charge density wave phase. Phonon modes self-energy parameters show anomalous changes around T* attributed to the electron-electron correlations, and renormalization rate of the phonon modes is much slower in the charge-ordered phase compared to the phase above T*. The transition around T* are marked by the suppression of electron-phonon coupling parameter by ~ 70 %, a change of the quasiparticle dynamics from non-Fermi liquid to the Landau-Fermi liquid type behaviour estimated using the low frequency Raman response.