The Origin of Weak Ferromagnetism in CaB6
强关联电子
2007-05-23 v1
摘要
We have combined the results of magnetization and Hall effect measurements to conclude that the ferromagnetic moments of lightly doped CaB6 samples display no systematic variation with electron doping level. Removal of the surface with acid etching substantially reduces the measured moment, although the Hall constant and resistivity are unaffected, indicating that the ferromagnetism largely resides on and near the sample surface. Electron microprobe experiments reveal that Fe and Ni are found at the edges of facets and growth steps, and on other surface features introduced during growth. Our results indicate that the weak ferromagnetism previously reported in undoped CaB6 is at least partly extrinsic.
引用
@article{arxiv.cond-mat/0306709,
title = {The Origin of Weak Ferromagnetism in CaB6},
author = {M. C. Bennett and J. van Lierop and E. M. Berkeley and J. F. Mansfield and C. Henderson and M. C. Aronson and D. P. Young and A. Bianchi and Z. Fisk and F. Balakirev and A. Lacerda},
journal= {arXiv preprint arXiv:cond-mat/0306709},
year = {2007}
}
备注
8 pages, 4 figures, figures relabeled