Field Dependence of the Muon Spin Relaxation Rate in MnSi
Abstract
Muon spin rotation/relaxation measurements have been performed in the itinerant helical magnet MnSi at ambient pressure and at 8.3kbar. We have found the following: (a)the spin-lattice relaxation rate 1/T1 shows divergence as T1T∝(T-Tc)β with the power β larger than 1 near Tc; (b)1/T1 is strongly reduced in an applied external field BL and the divergent behavior near Tc is completely suppressed at BL≥4000 G. We discuss that (a) is consistent with the self-consistent renormalization theory and reflects a departure from “mean-field” behavior, while (b) indicates selective suppression of spin fluctuations of the q=0 component by BL.
- Publication:
-
Physical Review Letters
- Pub Date:
- April 2003
- DOI:
- 10.1103/PhysRevLett.90.157201
- Bibcode:
- 2003PhRvL..90o7201G
- Keywords:
-
- 75.25.+z;
- 71.27.+a;
- 75.40.-s;
- 76.75.+i;
- Spin arrangements in magnetically ordered materials;
- Strongly correlated electron systems;
- heavy fermions;
- Critical-point effects specific heats short-range order;
- Muon spin rotation and relaxation