期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 141, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2020.109398
关键词
Nickelates; Ce-doped LaNiO3 thin films; Pulsed laser deposition; Raman spectroscopy; Non-fermi liquid
资金
- BRNS, India [37(3)/14/28/2017-BNRS/37225]
- SERB, DST, New Delhi [EMR/2017/001821]
- CSIR, New Delhi [1061751693]
- DST-FIST of the Discipline of Physics, IIT Indore [SR/FST/PSI-225/2016]
Thin films of La1-xCexNiO3 (x = 0, 0.1, and 0.3) are grown with two different thickness (8 and 24 nm) on singlecrystal LaAlO3 (001) (LAO) substrate using pulsed laser deposition. The films with x = 0 and 0.1 are highly oriented toward the (001) axis despite different thickness, whereas the higher doped films (x = 0.3) of both thicknesses show two crystallographic orientations. A significant shifting of Raman modes is observed due to increased Ce doping, clearly indicating a large change in Ni-O-Ni bond-angle and NiO6 octahedra distortion. Also, Raman modes show a red-shift in all the thin films with increases in temperature. These films remain metallic until low temperatures. The resistivity increases with increased Ce doping as well as with increased thickness. The resistivity data fit well with the power-law equation, indicating a non-Fermi liquid state. This study helps to distinguish the effects of Ce doping and thickness on the structure and Raman modes.
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