Yantao Cao, Andi Liu, Bin Wang, Mingxin Zhang, Yanpeng Qi, T. J. Hicken, H. Luetkens, Zhendong Fu, J. S. Gardner, Jinkui Zhao, Hanjie Guo
The discovery of high-temperature superconductivity in layered nickelates under pressure has recently triggered enormous interest. Studies of these compounds have revealed a density-wave-like transition at ambient pressure, though its connection with superconductivity is still not well understood. Here, we report a detailed $\mathrm{\textmu{}}\mathrm{SR}$ study on single crystals of trilayer nickelate ${\mathrm{La}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{10}$ at ambient pressure. We have identified a spin-density-wave (SDW) transition at the temperature of ${T}_{\mathrm{N}}\ensuremath{\sim}130\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, as well as a broad crossover around 70--100 K. Based on the temperature dependence of the muon precession amplitudes and magnetic susceptibility, we attribute this additional crossover either to a spin reorientation, or to an inhomogeneous SDW ordering.