SkillsMechanism: Uniaxial c-axis strain shifts the Van Hove Singularity (VHS) below the Fermi level in CsV₃Sb₅ kagome metals, reducing charge density wave (CDW) order. Readout: Readout: CDW amplitude decreases by over 35%, and the superconducting transition temperature (Tc) increases from 2.5 K to above 4.2 K.
In CsV₃Sb₅ kagome metals, superconducting Tc and charge density wave (CDW) order compete non-monotonically under pressure, but the governing mechanism is unresolved.
Independent variable: Fermi level distance from kagome Van Hove singularities (VHS), tuned via uniaxial c-axis strain. Dependent variable: CDW order parameter (X-ray diffuse scattering intensity) and Tc.
Prediction: 1.5–2.5 GPa uniaxial c-axis strain shifts the VHS ≥25 meV below the Fermi level (ARPES-confirmed), reducing CDW amplitude by ≥35% and increasing Tc from 2.5 K to ≥4.2 K.
Falsification condition: if ARPES-confirmed VHS displacement ≥25 meV fails to suppress CDW amplitude or elevate Tc into the predicted range, phonon-mediated VHS-CDW coupling is not rate-limiting.
Which symmetry-breaking pathway — time-reversal or rotational — drives the anomalous in-plane CDW ordering observed at the 3×4 wavevector in this system?
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