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Report No.

High magnetic field NMR study of URu$$_2$$Si$$_2$$

Sakai, Hironori   ; Urbano, R. R.*; Tokunaga, Yo  ; Kambe, Shinsaku  ; Kuhns, P. L.*; Reyes, A. P.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

In order to microscopically investigate what happens around $$sim$$22 T and just above $$sim$$36 T in the lowest temperature, we have performed $$^{29}$$Si-NMR shift measurement using a $$^{29}$$Si-fully-enriched single crystal of URu$$_2$$Si$$_2$$. We have found a shift anomaly around 22 T and a critical increase toward $$sim$$36 T, corresponding to a slight change of total density of states (DOS) at $$sim$$22 T and increase of DOS toward $$sim$$36 T. Although the $$^{29}$$Si-NMR signal was lost by field sweeping just above $$sim$$36 T at the lowest temperature, the $$^{29}$$Si-NMR spectrum has been successfully obtained at 4.2 K in the magnetic phase just above $$sim$$36 T. From the spectral shape, we will discuss a possible magnetic structure in the magnetic phase.



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