Anisotropic in plain Cu-O strain and the stripe quantum critical point in Y123

Anisotropic Cu-O strain has been measured and a relation between the superconducting critical temperature and the strain is studied in the YBa(2)Cu(3)O(6+k) (Y123). oxygen ordered YBa(2)Cu(3)O(6+k) phases. We show that the critical temperature scales both with the strain along the a axis (epsilon (a)) and along the b axis (epsilon (b)) While undoped, the system is close to the critical strain, epsilon (c)similar to0.043. The formation of chains with doping gives rise to a decrease of the Eb to take the system away From the critical point approaching the dynamical quantum stripe fluctuations (E(b)<E(c) and the E(a) increases to approach the phase of superconducting stripes (E(a)>E(c)).