Critical Divergence in MnSi - 1978
According to Moriya's self-consistent renormalization (SCR) theory
[T. Moriya and A. Kawabata, J. Phys. Soc. Jpn. 34,
639 (1973); 35, 669 (1973); or T. Moriya,
Spin Fluctuations in Itinerant Electron Magnetism
(Springer, New York, 1985)]
the critical fluctuations of the itinerant electron spin density
in MnSi extends unusually far away from the critical temperature
(Tc = 29.5K). The muon was recognized by
Yamazaki et al. as a handy probe for such fluctuations;
55Mn NMR had not been able to follow the relaxation
to within closer than 100K of the critical temperature.
A longitudinal field of 700 Oe was applied to quench any effects of
nuclear dipolar fields on the muon and the following ciritcal
divergence of the muon relaxation rate was observed:
Author: JHB.
Prepared by
Jess H. Brewer
Last modified: Thu Aug 13 22:40:09 PDT 1998