Field dependence of the muon spin relaxation rate in MnSi |
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Authors: | Gat-Malureanu I M Fukaya A Larkin M I Millis A J Russo P L Savici A T Uemura Y J Kyriakou P P Luke G M Wiebe C R Sushko Y V Heffner R H MacLaughlin D E Andreica D Kalvius G M |
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Institution: | Department of Physics, Columbia University, New York, NY 10027, USA. |
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Abstract: | 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). |
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