T-dependence of Resonant Fields in MnSi

In manganese silicide at any temperature above T_c = 29.5K, the muon Zeeman splitting matches the Mn nuclear quadrupole splitting at two longitudinal magnetic fields (since ⁵⁵Mn is spin 5/2). The values of these fields are, perhaps surprisingly, strongly temperature dependent. This is attributed [R. Kadono et al., Phys. Rev. B 48, 16803 (1993)] to critical behaviour of the electric field gradient in MnSi, due to the coupling between charge density and spin density fluctuations in this itinerant electron helimagnet. See 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)].

Author: JHB.

Prepared by Jess H. Brewer

Last modified: Thu Aug 13 16:02:43 PDT 1998