[8p-N404-1~16] 11.1 Fundamental properties

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)

[8p-N404-7] Theoretical study on optical control of the crystal structure of nickelate superconductor La₃Ni₂O₇ via nonlinear phononics

〇Shu Kamiyama¹, Tatsuya Kaneko¹, Kazuhiko Kuroki¹, Masayuki Ochi¹ (1.Univ. of Osaka)

Keywords:

nickelate superconductor,phonon,crystal structure

In this study, we theoretically investigate the possibility of controlling crystal structural of a bilayer nickelate superconductor La₃Ni₂O₇ under ambient pressure using light. This material exhibits superconductivity under pressure, accompanied by a structural phase transition. We focused on “nonlinear phononics”, which is a method of controlling structure by optical phonon excitation. We performed numerical simulations with first-principles calculations. As a result of the analysis, we confirmed the possibility of approaching the structure where the superconducting state is generated by adjusting the phonon mode of excitation.