[14p-K206-1~10] New trend in high Tc superconductors ~ What material is beyond cuprate ? ~

3:50 PM - 4:20 PM JST(6:50 AM - 7:20 AM UTC)

[14p-K206-6] Microscopic electronic states in multilayer nickelates investigated by NMR/NQR at ambient pressure

〇Hidekazu Mukuda¹ (1.Osaka univ.)

Keywords:

Superconductivity,Nickel oxide

Remarkable high-T_c superconductivity was reported for layered nickelate La₃Ni₂O₇ under high pressure. We report ¹³⁹La-NMR/NQR studies on the multiple(n)-layered nickelates La₃Ni₂O_7-δ and La₄Ni₃O_10-δ at ambient pressure(M. Kakoi et al. JPSJ. 93, 053702 (2024)). From our microscopic studies, we pointed out that these nickelates possess similar electronic states despite the difference in the formal valence of the Ni d-electron states. In this presentation, we discuss the microscopic electronic states that relates with the intrinsic crystal structure and possible crystal defects such as oxygen deficiency and stacking faults. It will give us a hint to understand the relation between the local crystal states, the novel high-T_c superconductivity states under high pressures, and cuprate superconductors.