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).
Gat-Malureanu
I M
IM
Department of Physics, Columbia University, New York, NY 10027, USA.
Fukaya
A
A
Larkin
M I
MI
Millis
A J
AJ
Russo
P L
PL
Savici
A T
AT
Uemura
Y J
YJ
Kyriakou
P P
PP
Luke
G M
GM
Wiebe
C R
CR
Sushko
Y V
YV
Heffner
R H
RH
MacLaughlin
D E
DE
Andreica
D
D
Kalvius
G M
GM