Specific Heat And Correlation Between Resistivity And Thermoelectric Power Of Gdba2(Cu1-Xmnx)(3)O7-Delta Htsc System For X <= 0.02

In this communication we present some theoretical results of specific heat and thermoelectric power of the superconductor GdBa2(Cu1-xMnx)(3)O7-delta(for x <= 0.02). A model based on separate electronic and phononic contributions is used for the interpretation of the specific heat data while a narrow band model is used for the analysis of thermoelectric power. On the basis of these models two main conclusions have been drawn about the relative effects of different Mn contents: (1) the observed fluctuation effects near T-c whose strength increases with increasing Mn content and (2) Mn produces mainly electronic effects for lower Mn contents, while for higher doping levels (x > 0.0075) Mn predominantly causes carrier-Mn scattering process. (C) 2008 Elsevier B.V. All rights reserved.