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Electronic phase diagram of oxygen-deficient SmNiO3-δ epitaxial thin films
CHEN Binjie,SUN Yan,YANG Nan,ZHONG Ni,ZHANG Yuanyuan,BAI Wei,SUN Lin,TANG Xiaodong,YANG Pinxiong,XIANG Pinghua * #,DUAN Chungang
Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241
*Correspondence author
#Submitted by
Subject:
Funding: Basic Research of China (No.Grant Nos. 2014CB921104 and 2013CB922301), Open Project Program of Key Laboratory of Inorganic Functional Materials and Devices, Chinese Academy of Sci-ences (No.No. KLIFMD-2014-02), Specialized Research Fund for the Doctoral Program of Higher Education of China (No.No. 20130076120023), National Key Project for National Natural Science Foundation of China (No.Nos. 11374098, 11304097)
Opened online:21 April 2017
Accepted by: none
Citation: CHEN Binjie,SUN Yan,YANG Nan.Electronic phase diagram of oxygen-deficient SmNiO3-δ epitaxial thin films[OL]. [21 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725913
 
 
Epitaxial SmNiO3-δ thin films were fabricated under various oxygen partial pressures (PO2) on (001)-oriented LaAlO3 substrates by pulsed laser deposition method. Continuous control of the metal-insulator transition temperature (TMI) from 350 K to 85 K has been achieved by varying PO2 from 26 Pa to 0.5 Pa. The reduction of TMI can be attributed to the straightening out of the out-of-plane Ni-O-Ni bond angle due to the elongation of unit cell volume with decrease of PO2. When PO2 > 3 Pa, the resistivity anomalies around 200 K are observed in the insulating phase of strained SmNiO3-δ films, suggesting the onset of antiferromagnetic ordering of the Ni sublattices. Based on the results of the transport measurements, an electronic phase diagram of the oxygen deficient SmNiO3-δ films has been established in this work.
Keywords:Physical electronics; Nickelate thin film; Electrical transport; Metal-insulator transition; Oxygen deficiency
 
 
 

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