Percolative nature of the transition from 60 K to 90 K phase in YBa2Cu3O6+d

S. Yu. Gavrilkin, O. M. Ivanenko, V. P. Martovitskii +2

We have measured the heat capacity of YBa2Cu3O6+d for 0.7<d<0.8 between 1.8 and 300K. It was found that doping dependences of specific heat jump and temperature of heat capacity ju…