Seebeck coefficient study on Mn-doped YBa < inf > 2 < /inf > Cu < inf > 3 < /inf > O < inf > 7 < /inf > -δ

Abstract

Superconducting samples of YBa2Cu3O7-δ 0.01, 0.015, 0.02, 0.025, 0.035, and 0.05 have been prepared and the temperature variation of the Seebeck coefficient, S(T), has been measured over a temperature region of 77 to 250 K. The observed features of the results are analyzed in terms of the metallic diffusion model, the Nagaosa-Lee model, and a narrow band model. The physical parameters obtained are discussed. © 1999 American Physical Society.