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Chin. Phys. B, 2018, Vol. 27(12): 127201    DOI: 10.1088/1674-1056/27/12/127201
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Effects of the band-filling and Fe/Mo disorder on physical properties of Ca2FeMoO6

Jin-Feng Wang(王金凤), Zhao-Tong Zhuang(庄照通), Shuai-Shuai Liu(刘帅帅), Qian-Qian Gao(高迁迁)
College of Physics and Materials Science, National Demonstration Center for Experimental Physics Education, Henan Normal University and Henan Key Laboratory of Photovoltaic Materials, Xinxiang 453007, China
Abstract  

Both the band filling effect and Fe/Mo disorder have a close correlation with the physical properties of the double perovskite Ca2FeMoO6. Two series of Ca2FeMoO6 and Nd0.3Ca1.7FeMoO6 ceramics sintered at (1050℃, 1200℃, and 1300℃) were specially designed to comparatively investigate the band-filling effect and Fe/Mo disorder on the physical properties of Ca2FeMoO6. The x-ray diffraction indicates that Fe/Mo disorder is sensitive to the sintering temperature. The magnetization behavior is mainly controlled by the Fe/Mo disorder not by the band filling effect, manifested by a close correlation of saturated magnetization (Ms) with the Fe/Mo disorder. Interestingly, magnetoresistance (MR) property of the same composition is dominantly contributed by the grain boundary strength, which can be expressed by the macroscopic resistivity values. However, the band filling effect caused by the Nd-substitution can decrease the spin polarization, and thus suppress the MR performance fundamentally. Contrary to the MR response, the Curie temperature (TC) shows an obvious optimization due to the band filling effect, which increases the carrier density near the Fermi level responsible for the ferromagnetic coupling interaction strengthen. Maybe, our work can provoke further research interests into the correlation of the band-filling effects and Fe/Mo disorder with the physical properties of other Fe/Mo-based double perovskites.

Keywords:  band filling effect      Fe/Mo disorder      Ca2FeMoO6      physical property  
Received:  01 August 2018      Revised:  02 October 2018      Accepted manuscript online: 
PACS:  72.25.Mk (Spin transport through interfaces)  
  75.47.Gk (Colossal magnetoresistance)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant No. U1504107) and the Doctoral Scientific Research Foundation (Grant No. qd15214).

Corresponding Authors:  Jin-Feng Wang     E-mail:  jfwang@htu.edu.cn

Cite this article: 

Jin-Feng Wang(王金凤), Zhao-Tong Zhuang(庄照通), Shuai-Shuai Liu(刘帅帅), Qian-Qian Gao(高迁迁) Effects of the band-filling and Fe/Mo disorder on physical properties of Ca2FeMoO6 2018 Chin. Phys. B 27 127201

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