Transport properties and electronic specific heat of

The effect of the partial substitution of Cu by Zn and La by Ba in La: 214 prepared by conventional solid state reaction method has been investigated by using Hall coefficient, Seebeck coefficient and electronic specific heat measurements, over the wide temperature range between 4.2 K and 300 K, in magnetic fields up to 5 T. The samples with y = 0 and d = 0, showed superconductivity for x between 0.055 and 0.30. The critical temperature, the Hall and Seebeck coefficients strongly depend on Zn content. The phonon specific heat C_ph and electronic specific heat C_e1 have been extracted from the total specific heat C. Zn-doping effect on the γ(T) = C_el/T behavior suggests that the large range "stripe order" and the fluctuating "stripe" suppress the singlet formation and pseudo gap.