Three-dimensional Fermi surfaces from charge order in layered <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">CsV</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Sb</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>
Xiangwei Huang, Chunyu Guo, Carsten Putzke, Martin Gutierrez‐Amigo, Yan Sun, Maia G. Vergniory, Ion Errea, Dong Chen, Claudia Felser, Philip J. W. Moll
Abstract
The cascade of electronic phases in ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ 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 ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ reflects in Brillouin-zone-sized quasi-two-dimensional Fermi surfaces and significant transport anisotropy. Yet here we demonstrate that ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$ 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 ${T}_{\mathrm{CDW}}\ensuremath{\approx}93\phantom{\rule{4.pt}{0ex}}\text{K}$ 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.