Spin-Density-Wave-Type Ordering of LaCoGe Revealed by

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The low-temperature magnetic properties of LaCoGe with the tetragonal CeFeSi-type structure were investigated by <sup>59</sup>Co- and <sup>139</sup>La-nuclear magnetic 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 at approximately 18 K, below which an inhomogeneous internal field appears at the Co nuclear site. These results indicate that antiferromagnetic ordering occurs below T_{\text{N}}\sim 18 K. However, an internal field was not observed at the La nuclear site below T_{\text{N}}. Taking all NMR results into account, we conclude that spin-density-wave (SDW)-type ordering occurs, where magnetic correlations are of the checkerboard type [\mbi{Q}=(\pi,\pi)] in the ab-plane and have a long periodicity along the c-axis with inhomogeneous ordered moments pointing to the c-axis.
2013-08-15