山东大学发表最新Nature论文

Core Viewpoint - The recent research on Ruddlesden-Popper structured double-layer nickelate La3Ni2O7 reveals its potential as a superconductor material, achieving a superconducting transition temperature (Tc) of approximately 80 K under pressures exceeding 14 GPa, while challenges remain in synthesizing high-quality single crystals without high-pressure oxygen growth conditions [2][4]. Group 1 - A study published in the journal Nature reports the observation of bulk superconductivity up to 96 K in pressurized nickelate single crystals synthesized at ambient pressure, breaking key limitations in the crystal growth of nickelate superconductors [4][9]. - The research team confirmed the high uniformity and excellent crystal quality of La2SmNi2O7-δ single crystals grown using a flux method, demonstrating clear bulk superconductivity, including zero-resistance phenomena at 21 GPa with a maximum onset Tc of 92 K and a maximum zero-resistance temperature of 73 K [7][9]. - The study indicates that both monoclinic and tetragonal crystal structures can support the superconductivity of the double-layer nickelate, with a correlation found between higher Tc under pressure and greater in-plane lattice distortion at ambient pressure [8][9]. Group 2 - The research provides effective pathways for achieving higher Tc in superconducting materials by elucidating the crystal structure characteristics of the superconducting state [9].