Weak ferromagnetism in CaB6

Authors

M. C. Bennett, University of Michigan, Ann Arbor
J. Van Lierop, University of Michigan, Ann Arbor
E. M. Berkeley, University of Michigan, Ann Arbor
J. F. Mansfield, University of Michigan, Ann Arbor
C. Henderson, University of Michigan, Ann Arbor
M. C. Aronson, University of Michigan, Ann Arbor
D. P. Young, National High Magnetic Field Laboratory
A. Bianchi, National High Magnetic Field Laboratory
Z. Fisk, National High Magnetic Field Laboratory
F. Balakirev, National High Magnetic Field Laboratory Los Almos
A. Lacerda, National High Magnetic Field Laboratory Los Almos

Document Type

Article

Publication Date

4-1-2004

Abstract

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 most likely of extrinsic origin.

Publication Source (Journal or Book title)

Physical Review B - Condensed Matter and Materials Physics

Recommended Citation

Bennett, M., Van Lierop, J., Berkeley, E., Mansfield, J., Henderson, C., Aronson, M., Young, D., Bianchi, A., Fisk, Z., Balakirev, F., & Lacerda, A. (2004). Weak ferromagnetism in CaB6. Physical Review B - Condensed Matter and Materials Physics, 69 (13) https://doi.org/10.1103/PhysRevB.69.132407