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

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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.

Original languageEnglish (US)
Article number106402
JournalPhysical review letters
Volume100
Issue number10
DOIs
StatePublished - Mar 12 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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