SPECIFIC-HEAT OF BI1.7PB0.3SR2CA2CU3O10-DELTA BY A NEW AC-DIFFERENTIAL METHOD

We have devised a new measurement method of the specific heat of high temperature superconductors, based on the ac-method of Sullivan and Se idel, but modified to be able to use it along a differential scheme. W e briefly present the method. We use it to obtain data on Bi1.7Pb0.3Sr 2Ca2Cu3O10-delta. The specific heat data covers the temperature range 20-200K. We extract several key parameters, e.g. the critical temperat ure (106.5K), the Debye temperature (245K), the Sommerfeld constant (2 3 mJ. mole(-1)K(-2)), and the electron-phonon coupling constant (1.46 beta(BCS)). In a Table, we compare the parameters obtained for similar 2223-Bi(Pb)SrCaCuO compounds.