Quantum and Classical Mode Softening Near the Charge-Density-Wave–Superconductor Transition of CuxTiSe2
H. Barath, M. Kim, J. F. Karpus, S. L. Cooper, P. Abbamonte, E. Fradkin, E. Morosan, R. J. Cava
DOI 10.1103/PhysRevLett.100.106402 · Physical Review Letters
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Abstract
Temperature- and x-dependent Raman scattering studies of the charge-density-wave (CDW) amplitude modes in CuxTiSe2 show that the amplitude mode frequency ω0 exhibits identical power-law scaling with the reduced temperature T/TCDW and the reduced Cu content x/xc, i.e., ω0∼(1−p)0.15 for p=T/TCDW or x/xc, suggesting that mode softening is independent of the control parameter used to approach the CDW transition. We provide evidence that x-dependent mode softening in CuxTiSe2 is associated with the reduction of the electron-phonon coupling constant, and that x-dependent “quantum“ (T∼0) mode softening suggests the presence of a quantum critical point within the superconductor phase of CuxTiSe2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CuxTiSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.15 | Pressure not reported | unknown |
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