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The low-temperature magnetic properties of LaCoGe with the tetragonalCeFeSi-type structure were investigated by ^{59}Co- and ^{139}La-nuclearmagnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements.The nuclear spin-lattice relaxation rate divided by the temperature, 1/(T_1 T),gradually increases with decreasing temperature and shows a kink atapproximately 18 K, below which an inhomogeneous internal field appears at theCo nuclear site. These results indicate that antiferromagnetic ordering occursbelow T_N ~ 18 K. However, an internal field was not observed at the La nuclearsite below T_N. Taking all NMR results into account, we conclude thatspin-density-wave (SDW)-type ordering occurs, where magnetic correlations areof the checkerboard type in the ab-plane and have a long periodicity along thec-axis with inhomogeneous ordered moments pointing to the c-axis.

Spin-Density-Wave-Type Ordering of LaCoGe Revealed by ^{59}Co- and ^{139}La-Nuclear Magnetic Resonance Measurements