Evolving Devil's staircase magnetization from tunable charge density waves in nonsymmorphic Dirac semimetals

Abstract

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

arXiv comment17 pages, 15 figures, Revised version to appear in Advanced Materials

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• Visualizing the internal structure of the charge-density-wave state in CeSbTe
• Monoclinic LaSb${}_2$ Superconducting Thin Films
• Large Negative Magnetoresistance in off-Stochiometric Topological Material PrSbTe
• Electronic switching of topology in LaSbTe
• Direct Visualization of a Disorder Driven Electronic Smectic Phase in Nonsymmorphic Square-Net Semimetal GdSbTe
• Chalcogen Doping Effect on the Insulator-to-Metal Transition in GdPS
• Evolution of Magnetoresistance in the magnetic topological semimetals NdSbxTe2-x