Abstract
The thermoelectric power of underdoped Gd 1− x Pr x Ba 2Cu 3O 7− δ with different Pr contents is measured. The experiments indicate that a hump in the temperature dependence of TEP appears above T c. This is considered to be associated with the opening of the normal-state pseudogap. The present experimental results and those reported by Tallon et al . [J.L. Tallon et al., Phys. Rev. Lett. 75 (1995) 4114.] are analyzed based on the opening of the pseudogap. The pseudogap excitation energy E G is obtained. Furthermore, a phase diagram of E G versus hole concentration p is given. The analysis may provide an effective way to estimate E G.
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