Me. Reeves et al., THERMODYNAMIC DETERMINATION OF THE ELECTRON-PHONON COUPLING STRENGTH IN YBA2CU3O7-DELTA, Journal of superconductivity, 7(1), 1994, pp. 257-259
The relative enthalpy of YBa2Cu3O7-delta has been measured between the
temperatures 273 and 700 K. From these data, we find that the electro
nic contribution to the specific heat is linear in temperature with a
Sommerfeld constant of 25 +/- 3 mJ/mole . K2. We analyze the data to s
how that the normal state of YBa2Cu3O7-delta is described by two condu
ction bands and strong electron-phonon coupling. The electron-phonon c
oupling is, in fact, sufficient to account for the high T(c) in YBa2Cu
O7-delta.