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KV3Sb5

\(KV_3Sb_5\)

Similar to CsV3Sb5, \(KV_3Sb_5\) is also from the AV3Sb5 family which is a Kagome metal and shares lots of common AV3Sb5 general properties.

  • Transition temperature, \(T_c\) = 0.93K
  • Fermi surface in KV3Sb5 exhibit diverse CDW gap structures.
  • The CDW gap vanishes for the α FS around the BZ Γ point. Since the \(\alpha\) FS stems from the \(p_z\) band of the in-plane Sb, the \(p_z\) orbital does not participate in the CDW formation.

KV3Sb5_ARPES.png - V-derived Fermi surface around the BZ boundary exhibit highly momentum-dependent CDW gaps. - These are dominated by quasiparticles around the van Hove singularities at the M points. - V kagome layer dominates the CDW gaps, and the VH quasiparticles deeply influence the gap structure in \(AV_3Sb_5\).

CDW_gaps_KV3Sb5.png ARPES measured band structures (right) and their second derivatives. There are two additional CDW gaps at \(MG_2\)(150meV) and \(MG_3\)(125meV) away from \(E_F\) at 20K.

Important

This feature strongly indicates that the structural transition plays an important role in this CDW transition. It is also clear that the structural transition mostly affects the V kagome network, while the out-of-plane coupling involving Sb pz orbitals is hardly changed.