Field dependence of the muon spin relaxation rate in MnSi.
Muon spin rotation/relaxation measurements have been performed in the itinerant helical magnet MnSi at ambient pressure and at 8.3 kbar. We have found the following: (a) the spin-lattice relaxation rate 1/T(1) shows divergence as T1T proportional, variant (T-T(c))(beta) with the power beta larger than 1 near T(c); (b) 1/T(1) is strongly reduced in an applied external field B(L) and the divergent behavior near T(c) is completely suppressed at B(L)> or =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 B(L).
Department of Physics, Columbia University, New York, NY 10027, USA.
I M
IM
Gat-Malureanu
A
A
Fukaya
M I
MI
Larkin
A J
AJ
Millis
P L
PL
Russo
A T
AT
Savici
Y J
YJ
Uemura
P P
PP
Kyriakou
G M
GM
Luke
C R
CR
Wiebe
Y V
YV
Sushko
R H
RH
Heffner
D E
DE
MacLaughlin
D
D
Andreica
G M
GM
Kalvius