Title : High oxygen pressure floating zone growth and crystal structure of the metallic nickelates R4Ni3O10 (R = La, Pr)

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Affiliation of Author(s):晶体材料研究所

Title of Paper:High oxygen pressure floating zone growth and crystal structure of the metallic nickelates R4Ni3O10 (R = La, Pr)

Journal:Physical Review Materials

Place of Publication:American Physical Society

Abstract: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.

First Author:Junjie Zhang

Indexed by:Unit Twenty Basic Research

Document Code:2B237CE95864437FA4060B32BF794279

Discipline:Engineering

First-Level Discipline:Materials Science and Engineering

Document Type:J

Volume:4

Page Number:083402

Translation or Not:no

Date of Publication:2020-08-01

Included Journals:SCI