Evolving Devil's Staircase Magnetization from Tunable Charge Density Waves in Nonsymmorphic Dirac Semimetals

While several magnetic topological semimetals have been discovered in recent years, their band structures are far from ideal, often obscured by trivial bands at the Fermi energy. Square-net materials with clean, linearly dispersing show potential to circumvent this issue. CeSbTe, a square-net material, features multiple field-controllable phases. Here, it is shown that even higher degrees of tunability can be achieved changing electron count motif. Increased filling results structural distortion and formation charge density waves (CDWs). The modulation wave-vector evolves continuously leading region discrete CDWs corresponding complex "Devil's staircase" ground state. A series fractionally quantized magnetization plateaus observed, which implies direct coupling between CDW collective spin-excitation. It further creates robust idealized non-symmorphic Dirac semimetal, thus providing access systems rich magnetism.