Ubiquity of amplitude-modulated magnetic ordering in the H − T phase diagram of the frustrated non-Fermi-liquid YbAgGe

YbAgGe contains a magnetic geometrically frustrated kagome-like lattice that features significant local single-ion anisotropy. The electronic state is established by hybridization of 4$f$ and conduction electrons, leading to heavy electronic masses. Competition between these various interactions leads to nontrivial behavior under external magnetic field. Here, the authors present neutron diffraction experiments under magnetic fields up to 8 T in the hexagonal plane, revealing the microscopic nature of the first four subsequent magnetic states, and propose further steps to understand the microscopic interactions.