38 Ë 2 Superconducting materials
Fig. 2.6:Temperature dependence of the specific heatC(T) of the Bi2212, Nb 3 Sn, and MgB 2 samples
at 0 T [126].
Fig. 2.7:Temperature dependence of the specific heatC(T) of a YBCO-coated conductor YCC-Ag20,
YCC-Ag10Cu300, and Hastelloy+buffer tapes [127].
Gahtori et al. [128] reported the temperature dependence of the specific heatC(T) of
GdBa 2 (Cu 1 −xMnx) 3 O 7 −훿for differentx(see Fig. 2.8) and gave the theoretical calculation
results [129]. The model based on separate electron and phonon contributions was
used to interpret the specific heat data. The substitution of Mn in the system has
been found to effectively suppress the specific heat jump observed in the pristine
compound. In the lower right corner of Fig. 2.6, it can be seen clearly that the specific
heat of HTS Bi2212 is higher than LTS Nb 3 Sn and MgB 2 in the same temperature range.
Knowledge of specific heat and thermal conductivity of HTS is essential to un-
derstand the response of the superconductor to heat released due to variations of the
applied magnetic field, for instance, the heat response of the superconductor during