Ru-101 nuclear magnetic resonance/nuclear quadrupole resonance (NMR/NQR) and Si-29 NMR studies of the metamagnetic-like transition in CeRu2Si2

The metamagnetic-like transition at an external field(H-ext) similar to 7.7 T (H-M) in CeRu2Si2 has been probed by Ru-101 NMR/NQR and Si-29 NMR measur ements in an external field up to 16.4 T. The nuclear spin-lattice relaxati on rate (T-1(-1)) of Ru-101 is held dependent at low temperatures (T). The value of (T1T)(-1) remains T-independent below 7 K in zero field, whereas t he value of(T1T)(-1) at HM continues to increase down to 1.4 K. At a field of 16.4 T (a field much higher than H-M). (T1T)(-1) behaves independently o f T again, as expected for the Fermi liquid state, where the value of (T1T) (-1) is much smaller than that in zero field. The field dependence of the s pin-echo decay rate (T-2(-1)) measured at 4.2 K by means of NMR for both Ru -101 and Si-29 exhibits no anomalynear HM, suggesting the absence of any en hancement of the ferromagnetic spin fluctuations.