Ammonia and iron cointercalated iron sulfide (NH3) Fe0.25Fe2S2: hydrothermal synthesis, crystal structure, weak ferromagnetism and crossover from a negative to positive magnetoresistance

	Ammonia and iron cointercalated iron sulfide (NH3) Fe0.25Fe2S2: hydrothermal synthesis, crystal structure, weak ferromagnetism and crossover from a negative to positive magnetoresistance
	Lai, Xiaofang 1; Lin, Zhiping 2; Bu, Kejun 3; Wang, Xin 1; Zhang, Hui 3; Li, Dandan 2; Wang, Yingqi 1; Gu, Yuhao 1; Lin, Jianhua 1; Huang, Fuqiang 1,3
刊名	RSC ADVANCES
	2016
卷号	6 期号:85 页码:81886-81893
英文摘要	The discovery of superconductivity in anti-PbO-type FeS has aroused a renewed interest in the intercalation compounds of FeS. Here we report a novel intercalation compound of FeS with the chemical composition of (NH3)Fe0.25Fe2S2, which is synthesized via a new hydrothermal reaction. This material crystallizes in the tetragonal space group I4/mmm, preserving the FeS tetrahedral layers with ammonia and excess iron forming planes in between. The microstructure and thermal stability of the sample were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermogravimetric analyses (TGA). These results suggest that (NH3)Fe0.25Fe2S2 is not sensitive to electron beam irradiation and is more thermally stable than the other ammonia intercalated iron selenide superconductors. Physical property measurements show that it is a ferromagnetic semiconductor. By using first-principles calculations we assess that the low-temperature ferromagnetism originates from the interlayer rather than the intralayer iron. The transport properties at low temperatures are dominated by electron-like carriers and the sign reversal and strong temperature dependence of the Hall coefficient may be caused by a multi-band effect. Most importantly, an unusual crossover from negative to positive magnetoresistance with increasing temperature was identified, which reveals relatively strong coupling between carriers and magnetic moments as well as disorder.
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/35273]
专题	化学研究所_高分子物理与化学实验室
作者单位	1.Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Rare Earth Mat Chem & Applicat, Coll Chem & Mol Engn, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Phys, Res & Dev Ctr Funct Crystals, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China
推荐引用方式 GB/T 7714	Lai, Xiaofang,Lin, Zhiping,Bu, Kejun,et al. Ammonia and iron cointercalated iron sulfide (NH3) Fe0.25Fe2S2: hydrothermal synthesis, crystal structure, weak ferromagnetism and crossover from a negative to positive magnetoresistance[J]. RSC ADVANCES,2016,6(85):81886-81893.
APA	Lai, Xiaofang.,Lin, Zhiping.,Bu, Kejun.,Wang, Xin.,Zhang, Hui.,...&Huang, Fuqiang.(2016).Ammonia and iron cointercalated iron sulfide (NH3) Fe0.25Fe2S2: hydrothermal synthesis, crystal structure, weak ferromagnetism and crossover from a negative to positive magnetoresistance.RSC ADVANCES,6(85),81886-81893.
MLA	Lai, Xiaofang,et al."Ammonia and iron cointercalated iron sulfide (NH3) Fe0.25Fe2S2: hydrothermal synthesis, crystal structure, weak ferromagnetism and crossover from a negative to positive magnetoresistance".RSC ADVANCES 6.85(2016):81886-81893.