Abstract
The low-temperature magnetic properties of LaCoGe with the tetragonal CeFeSi-type structure were investigated by 59Co- and 139La-nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements. The nuclear spin–lattice relaxation rate divided by the temperature, 1/(T1T), 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 TN∼18 K. However, an internal field was not observed at the La nuclear site below TN. Taking all NMR results into account, we conclude that spin-density-wave (SDW)-type ordering occurs, where magnetic correlations are of the checkerboard type [Q=(π,π)] in the ab-plane and have a long periodicity along the c-axis with inhomogeneous ordered moments pointing to the c-axis.
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