PRL 100 106402 Barath et al. : Quantum and Classical Mode Softening Near the Charge-Density-Wave-Superconductor Transition of CuxTiSe2

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• Paul Nahai-Williamson
• Friday 16 May 2008, 11:00-12:00
• tba.

If you have a question about this talk, please contact Eoin O'Farrell.

Temperature- and x-dependent Raman scattering studies of the charge-density-wave (CDW) amplitude modes in CuxTiSe2 show that the amplitude mode frequency omega0 exhibits identical power-law scaling with the reduced temperature T/TCDW and the reduced Cu content x/xc, i.e., omega0_{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.

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