Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-12-12
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures, uses docs.sty
Scientific paper
10.1103/PhysRevLett.100.106402
Temperature- and x-dependent Raman scattering studies of the charge density wave (CDW) amplitude modes in CuxTiSe2 show that the amplitude mode frequency omega_o exhibits identical power-law scaling with the reduced temperature, T/T_CDW, and the reduced Cu content, x/x_c, i.e., omega_o ~ (1 - p)^0.15 for p = T/T_CDW or x/x_c, 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 caused by the reduction of the electron-phonon coupling constant lambda due to expansion of the lattice, and that x-dependent `quantum' (T ~ 0) mode softening reveals a quantum critical point within the superconductor phase of CuxTiSe2.
Abbamonte Peter
Barath H.
Cava Robert. J.
Cooper Lance S.
Fradkin Eduardo
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