Magnetic breakdown and band topology in the Kagome superconductor CsV₃Sb₅

March 23, 2023

In a study published in Physical Review Letters, researchers probe the electronic band structure underlying exotic correlated electronic states in CsV₃Sb₅.

(a) Repeated zone scheme of the 2x2 reconstructed Fermi surface of CsV₃Sb₅ for kz = ±π/c (b) Detail of the x2 and v orbits. (c) High-frequency oscillation spectrum. The k orbit corresponds to the sum of the x2 and v orbits, while the t orbit represents two basic triangular v units. ℜ, ℒ, X contain 3, 4 and 5 triangular building blocks, respectively. ∂ is the sum of the x2 and t orbits

Scientific Achievement

Quantum oscillation measurements reveal first image of theoretically-predicted large Fermi surface sheets, magnetic breakdown, and topological phases.

Significance and Impact

Our measurement of the reconstructed electronic bands provides essential input to the understanding of unconventional superconductivity in Kagome lattice materials.

Research Details

Synthesis of high-quality single crystals of CsV₃Sb₅ displaying coexistence of superconductivity and charge density wave order
dHvA measurements in pulsed fields up to 85 T using the tunnel diode oscillator technique
Self-consistent model of the folded Fermi surface and of magnetic breakdown orbits

DOI: 10.1103/PhysRevLett.130.126401

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