THERMOELECTRIC-POWER OF A LOCAL PAIR MODEL AND ITS APPLICABILITY TO YBA2CU3O7

A formula of thermoelectric power (TEP) for the local pair model has been derived. It has been found that from T-c to about 125 K the TEP data of YBa2Cu3O7 (Y-123) can be described by this formula. We have also found that the formula of the diffusion thermoelectricity in the free electron approximation can be used to express the TEP data of Y-123 in the region of 220 to about 300 K. It seems that a general transition occurs in the intermediate temperature region, that is from the regime in which the local pair subsystem is dominating to the regime in which the itinerant carrier subsystem is dominating.