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Title: Density-wave order and pairing in pressurized CsCr3Sb5
Plain: CsCr3Sb5, a chromium kagome metal, forms a density wave at normal pressure and becomes a superconductor near 6 K when squeezed, next to a metal whose resistance is linear in temperature; what the density wave is and whether its fluctuations pair the electrons is unknown.
Precise: At ambient pressure CsCr3Sb5 undergoes a coupled charge and spin density-wave transition at about 50 to 60 K; under pressure of roughly 40 kbar and above it is suppressed, superconductivity with $T_{c}$ up to $\sim 6\,\mathrm{K}$ appears, and the normal state shows non-Fermi-liquid resistivity (Liu et al., Nature 2024). Identify the density-wave order (wavevector, moment arrangement, altermagnetic or not) and determine whether its quantum critical fluctuations drive pairing. An answer is a refined magnetic structure and pressure phase diagram from neutron scattering, muSR or NMR under pressure, plus a gap-symmetry measurement in the superconducting phase.
Settled by: Magnetic structure determination at ambient pressure followed under pressure to the superconducting dome, with gap structure from penetration depth or NMR under pressure.
Kind: well-posed
Answer type: identification
References: (empty)
Literature status: open
Status note: An altermagnetic ground state of the distorted structure was proposed in 2025 (Nature Communications); the order under pressure near the superconducting dome is unmeasured.
Posed since: 2024