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题名:
Pressure-induced structural evaluation and insulator-metal transition in the mixed spinel ferrite Zn0.2Mg0.8Fe2O4
作者: Rahman, S; Samanta, S; Errandonea, D; Yan, S; Yang, K; Lu, JL; Wang, L
刊名: PHYSICAL REVIEW B
出版日期: 2017
卷号: 95, 期号:2, 页码:-
DOI: 10.1103/PhysRevB.95.024107
文章类型: 期刊论文
英文摘要: The effect of pressure on the electronic properties and crystal structure in amixed spinel ferrite Zn0.2Mg0.8Fe2O4 was studied for the first time up to 48 GPa at room temperature using x-ray diffraction, Raman spectroscopy, and electrical transport measurements. The sample was cubic (spinel-type Fd (3) over bar 3m) at ambient pressure and underwent a pressure-induced structural transition to an orthorhombic phase (CaTi2O4-type Bbmm) at 21GPa. This structural transformation corresponded to a first-order phase transition that involved 7.5% molar volume shrinkage. The onset of the Mott insulator-metal transition (IMT) around 20 GPa was due to a spin crossover mechanism that led to the Fe3+ magnetic moment collapse. All the Raman modes disappeared at high pressures, which supported metallization. Analysis of structural and electrical transport measurements showed a simultaneous volume collapse and sharp IMT within a narrow pressure range. The orthorhombic high-pressure phase was found to have a higher conductivity than the cubic phase. The pressure dependence of the conductivity supported the metallic behavior of the high-pressure phase.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000391851100001
ISSN号: 2469-9950
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/27418
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Rahman, S,Samanta, S,Errandonea, D,et al. Pressure-induced structural evaluation and insulator-metal transition in the mixed spinel ferrite Zn0.2Mg0.8Fe2O4[J]. PHYSICAL REVIEW B,2017-01-01,95(2):-.
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文件名: Pressure-induced structural evaluation and insulator-metal transition in the mixed spinel ferrite Zn0.2Mg0.8Fe2O4.pdf
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