Density-wave-like gap evolution in La3Ni2O7 under high pressure revealed by ultrafast optical spectroscopy

Yanghao Meng, Yi Yang, Hualei Sun, Sasa Zhang, Jianlin Luo, Liucheng Chen, Xiaoli Ma, Meng Wang (), Fang Hong (), Xinbo Wang () and Xiaohui Yu ()
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Yanghao Meng: Chinese Academy of Sciences
Yi Yang: Chinese Academy of Sciences
Hualei Sun: Sun Yat-sen University
Sasa Zhang: Shandong University
Jianlin Luo: Chinese Academy of Sciences
Liucheng Chen: Chinese Academy of Sciences
Xiaoli Ma: Chinese Academy of Sciences
Meng Wang: Sun Yat-Sen University
Fang Hong: Chinese Academy of Sciences
Xinbo Wang: Chinese Academy of Sciences
Xiaohui Yu: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Density wave (DW) order is believed to be correlated with superconductivity in the recently discovered high-temperature superconductor La3Ni2O7. However, experimental investigations of its evolution under high pressure are still lacking. Here, we explore the quasiparticle dynamics in bilayer nickelate La3Ni2O7 single crystals using ultrafast optical pump-probe spectroscopy under high pressures up to 34.2 GPa. At ambient pressure, the temperature-dependent relaxation dynamics demonstrate a phonon bottleneck effect due to the opening of an energy gap around 151 K. The energy scale of the DW-like gap is determined to be 66 meV by the Rothwarf-Taylor model. Combined with recent experiential results, we propose that this DW-like transition at ambient pressure and low temperature is spin density wave (SDW). With increasing pressure, this SDW order is significantly suppressed up to 13.3 GPa before it completely disappears around 26 GPa. Remarkably, at pressures above 29.4 GPa, we observe the emergence of another DW-like order with a transition temperature of approximately 135 K, which is probably related to the predicted charge density wave (CDW) order. Our study provides the experimental evidences of the evolution of the DW-like gap under high pressure, offering critical insights into the correlation between DW order and superconductivity in La3Ni2O7.

Date: 2024
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DOI: 10.1038/s41467-024-54518-1

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