Electronic specific heat of La2-x-zNdzSrxCu1-yZnyO4 up to room temperature

Behavior of the electronic specific heat C-el of La2-x-zNdzSrxCu1-yZnyO4 ha s been investigated over the wide temperature (T) range between 2 K and 300 K For samples with z = 0.4 and 0.0 less than or equal to x less than or eq ual to 0.25, by carefully subtracting the phonon contribution from the tota l specific heat, the electronic specific heat coefficient gamma = C-el/T ha s been extracted, where anomalous x- and T-dependence related to the so-cal led 1/8 problem or the "stripe" order is observed. Zn-doping effects on the behavior of gamma(T) of La2-xSrxCu1-yZnyO4 (x = 0.10 and 0.08) and La1.88- zNdzSr0.12Cu1-yZnyO4 (z = 0.2 and 0.4) suggest that not only the long range "stripe" order but also the fluctuating "stripe" suppress both the pseudo gap and the singlet pair formation.