Three-dimensional Fermi surfaces from charge order in layered CsV3Sb5

The cascade of electronic phases in CsV3Sb5 raises the prospect to disentangle their mutual interactions in a clean, strongly interacting kagome lattice. When the kagome planes are stacked into a crystal, its electronic dimensionality encodes how much of the kagome physics and its topological aspects survive. The layered structure of CsV3Sb5 reflects in Brillouin-zone-sized quasi-two-dimensional Fermi surfaces and significant transport anisotropy. Yet here we demonstrate that CsV3Sb5 is a three-dimensional (3D) metal within the charge density wave (CDW) state. Small 3D pockets play a crucial role in its low-temperature magneto-and quantum transport. Their emergence at T-CDW asymptotic to 93 K results in an anomalous sudden increase of the in-plane magnetoresistance by four orders of magnitude. The presence of these 3D pockets is further confirmed by quantum oscillations under in-plane magnetic fields, demonstrating their closed nature. These results emphasize the impact of interlayer coupling on the kagome physics in 3D materials.

Automated summary

The cascade of electronic phases in CsV3Sb5 provides an opportunity to study the mutual interactions in a clean, strongly interacting kagome lattice. CsV3Sb5 is a three-dimensional metal in the charge density wave state and exhibits anomalous magnetoresistance at low temperatures.