Structure responsible for the superconducting state in La3Ni2O7 at high pressure and low temperature conditions

超导电性 正交晶系 四方晶系 凝聚态物理 相图 八面体 材料科学 晶体结构 相(物质) 环境压力 结晶学 化学 物理 热力学 有机化学
作者
Luhong Wang,Yan Li,Sheng‐Yi Xie,Fuyang Liu,Hualei Sun,Caoxin Huang,Yang Gao,Takeshi Nakagawa,Boyang Fu,Bo Dong,Zhenhui Cao,Runze Yu,Saori I. Kawaguchi,Hirokazu Kadobayashi,Meng Wang,Changqing Jin,Ho‐kwang Mao,Haozhe Liu
出处
期刊:Cornell University - arXiv 被引量:9
标识
DOI:10.48550/arxiv.2311.09186
摘要

Very recently, a new superconductor with Tc = 80 K was reported in nickelate (La3Ni2O7) at around 15 - 40 GPa conditions (Nature, 621, 493, 2023) [1], which is the second type of unconventional superconductor, beside the cuprates, with Tc above liquid nitrogen temperature. However, the phase diagram plotted in this report was mostly based on the transport measurement at low temperature and high pressure conditions, and the assumed corresponding X-ray diffraction (XRD) results was carried out at room temperature. This encouraged us to carry out in situ high pressure and low temperature synchrotron XRD experiments to determine which phase is responsible for the high Tc state. In addition to the phase transition from orthorhombic Amam structure to orthorhombic Fmmm structure, a tetragonal phase with space group of I4/mmm was discovered when the sample was compressed to 19 GPa at 40 K where the superconductivity takes palce in La3Ni2O7. The calculations based on this tetragonal structure reveal that the electronic states approached to the Fermi energy were mainly dominated by the eg orbitals (3dz2 and 3dx2-y2) of Ni atoms, which are located in the oxygen octahedral crystal field. The correlation between Tc and this structural evolution, especially Ni-O octahedra regularity and the in-plane Ni-O-Ni bonding angles, are analyzed. This work sheds new lights to identify what is the most likely phase responsible for superconductivity in the double layered nickelate.
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