Nature CommunicationsRevealing superconducting gap in La3Ni2O7-δ by Andreev reflection spectroscopy under high pressureJianning GuoYuzhi ChenYulong WangHualei SunDeyuan HuMeng WangXiaoli HuangTian Cui2025-12-02Full textDOI https://doi.org/10.1038/s41467-025-65865-y