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Abstract:
We report P-31 and Si-29 NMR in single crystals of URu2Si2-x P-x for x = 0.09 and x = 0.33. The spectra in the x = 0.33 sample are consistent with a homogenous commensurate antiferromagnetic phase below T-N similar to 37 K. The Knight shift exhibits an anomaly at the coherence temperature T* that is slightly enhanced with P doping. Spin-lattice-relaxation rate data indicate that the density of states is suppressed for x = 0.09 below 30 K, similar to the undoped compound, but there is no evidence of long-range order at this concentration. Our results suggest that Si substitution provides chemical pressure and electronic tuning mediated by filling of the s/p shells with minimal electronic inhomogeneity.
