Abstract
CeRhIn5 is an incommensurate antiferromagnet with TN=3.8 K. The NMR spectra for tetragonal In(1) sites in CeRhIn5 have been investigated under zero applied field in order to distinguish between spin density wave or spiral order. The 115In(1)-NMR spectra around 2νQ under zero field below TN provide a good indication of spiral order. The La substitutions of 1 % and 2 % indicate a decrease of the internal field on In(1) sites due to the reduction of hyperfine couplings by La substitutions.
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