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

doi:10.1088/1674-1056/27/12/127201

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 Nd_0.3Ca_1.7FeMoO₆ 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 (M_s) 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 (T_C) 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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Effects of the band-filling and Fe/Mo disorder on physical properties of Ca2FeMoO6

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