Abstract
The interplay between transport properties, structural phase transitions and superconductivity in La 2− x− y Nd y Ba x CuO 4 ( y = 0.20) has been studied. We found that the temperature at which the thermopower S( T) begins to show an unusual decrease on cooling coincides with that of the minimum in the resistivity for the samples with x around 1 8 . Moreover, the appearance of negative thermopower accompanies the suppression of superconductivity. In contrast, we did not find any anomaly in the thermopower at the structural phase transition temperature T d2 for any of the samples in this study. The results show that in this series of compounds, the suppression of superconductivity around x = 1 8 is not directly associated with the structural phase transition but with the profound change of the transport properties. The present results are consistent with the charge ordering as suggested by recent electron diffraction as well as neutron diffraction studies.
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