Optical phonons along the c axis of YBa_2Cu_3O_{6+x}, for x=0.5 -> 0.95

C. C. Homes, T. Timusk, D. A. Bonn +2

The c-axis polarized phonon spectra of single crystals of YBCO_{6+x} have been measured for the doping range x=0.5 -> 0.95, between 10 K and 300 K. The low background electronic co…