类型 方法 频次 2 别名 high-pressure electrical resistance measurements 相关论文 Heavily Sr-Doped La2SrNi2O7-δ as a Tetragonal Ruddlesden-Popper Phase at Ambient Pressure Expanding the trilayer Ruddlesden-Popper nickelate family: Synthesis and characterization of Sm4Ni3O10-δ single crystals