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We investigate the thermodynamic, magnetic, and electrical transportproperties of a triangular-lattice antiferromagnet EuZnGe using single crystalsgrown from Eu-Zn flux in sealed tantalum tubes. Magnetic properties are foundto be isotropic in the paramagnetic state while we observe an enhancement ofin-plane magnetic susceptibility at the temperature near T* =11.3 K, suggestingan easy-plane anisotropy at low temperatures. Magnetic transition temperatureis lower than T* as specific heat shows a peak at TN =7.6 K. We reveal themagnetic modulation along the c axis by resonant x-ray scattering at Eu L2edge, which suggests competing magnetic interaction among Eu triangular-latticelayers. We observe a double-peak structure in the intensity profile along (0,0, L) below TN, which is mainly composed of a dominant helical modulation withq ~ (0, 0, 0.4) coexisting with a secondary contribution from q ~ (0, 0, 0.5).We reproduce the intensity profile with a random mixture of five- andfour-sublattice helices with spin rotation skipping due to hexagonal in-planeanisotropy. The metallic conductivity is highly anisotropic with the ratiorho_zz/rho_xx exceeding 10 over the entire temperature range and additionallyexhibits a sharp enhancement of rho_zz at TN giving rise to rho_zz/rho_xx ~ 50,suggesting a coupling between out-of-plane electron conduction and the spiralmagnetic modulations. In-plane magnetic field induces a spin-flop liketransition, where the q = 0.4 peak disappears and an incommensurate peak ofapproximately qICM ~ 0.47 emerges, while the q = 0.5 modulation retains afinite intensity. This transition correlates with non-monotonicmagnetoresistance and Hall resistivity, suggesting a significant interplaybetween electrons and spin structures through Ruderman-Kittel-Kasuya-Yosida(RKKY) interaction.

Anisotropic magnetotransport properties coupled with spiral spin modulation in a triangular-lattice magnet EuZnGe