铜铁氧体：跳跃传导与铁磁性。

Cu Fe O: hopping transport and ferromagnetism.

作者信息

Nasir Mohd, Islam Rakibul, Ahmed Md A, Ayaz Saniya, Kumar Gautham, Kumar Sunil, Prajapat C L, Roussel Frederick, Biring Sajal, Sen Somaditya

机构信息

Department of Physics, Indian Institute of Technology Indore, Indore 453552, India.

Unite Materiaux et Transformations (UMET)-CNRS UMR 8207, University of Lille-Sciences and Technologies, UFR de Physique, Bat P5, 59655 Villeneuve d'Ascq, France.

出版信息

R Soc Open Sci. 2017 Sep 13;4(9):170339. doi: 10.1098/rsos.170339. eCollection 2017 Sep.

DOI:10.1098/rsos.170339

PMID:28989741

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5627081/

Abstract

Single phase, sol-gel prepared Cu Fe O (0 ≤ ≤ 0.125) powders are characterized in terms of structural, electronic and magnetic properties. Using dielectric and magnetic studies we investigate the coupling of electron and spin. The electrical conductivities and activation energies are studied with increasing Fe content. Modelling of experimental conductivity data emphasizes a single hopping mechanism for all samples except = 0.125, which have two activation energies. Hole doping is confirmed by confirming a majority Fe substitution of Cu in CuO from X-ray photoelectron spectroscopy studies (XPS). Such a substitution results in stabilized ferromagnetism. Fe substitution introduces variation in coercivity as an intrinsic magnetic property in Fe-doped CuO, and not as a secondary impurity phase.

摘要

通过溶胶 - 凝胶法制备的单相CuₓFe₁₋ₓO₂（0 ≤ x ≤ 0.125）粉末，对其结构、电子和磁性进行了表征。利用介电和磁性研究，我们研究了电子与自旋的耦合。随着铁含量的增加，对电导率和活化能进行了研究。对实验电导率数据的建模强调，除x = 0.125（具有两个活化能）外，所有样品均存在单一跳跃机制。通过X射线光电子能谱研究（XPS）证实了CuO中大部分Fe替代Cu，从而确认了空穴掺杂。这种替代导致了稳定的铁磁性。Fe替代引入了矫顽力的变化，这是掺杂Fe的CuO中的一种固有磁性，而非次生杂质相导致的。