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所属单位：晶体材料研究所

发表刊物：Physical Review Materials

刊物所在地：American Physical Society

摘要：Single crystals of the metallic Ruddlesden-Popper trilayer nickelates R4Ni3O10 (R = La, Pr) were successfully
grown using an optical-image floating zone furnace under oxygen pressure (pO2) of 20 bar for La4 Ni3O10
and 140 bar for Pr4Ni3O10. A combination of synchrotron and laboratory x-ray single-crystal diffraction,
high-resolution synchrotron x-ray powder diffraction and measurements of physical properties revealed that
R4Ni3O10 (R = La, Pr) crystallizes in the monoclinic P21/a (Z = 2) space group at room temperature, and
that a metastable orthorhombic phase (Bmab) can be trapped by postgrowth rapid cooling. Both La4Ni3O10
and Pr4Ni3O10 crystals undergo a metal-to-metal transition (MMT) below room temperature. In the case of
Pr4Ni3O10, the MMT is found at 157.6 K. For La4Ni3O10, the MMT depends on the lattice symmetry: 147.5
K for Bmab vs 138.6 K for P21/a. Lattice anomalies were found at the MMT that, when considered together
with the pronounced dependence of the transition temperature on subtle structural differences between Bmab
and P21/a phases, demonstrate a not insignificant coupling between electronic and lattice degrees of freedom in
these trilayer nickelates.

第一作者：张俊杰

论文类型：基础研究

论文编号：2B237CE95864437FA4060B32BF794279

学科门类：工学

一级学科：材料科学与工程

文献类型：J

卷号：4

页面范围：083402

是否译文：否

发表时间：2020-08-01

收录刊物：SCI