Abstract
The correlation between the crystal structure, thermoelectric power and superconductivity has been investigated in the tetragonal low-temperature (TLT) phase of La 1.6 − x Nd 0.4Sr x CuO 4 with 0.10 ⩽ × ⩽ 0.25. The crystal structure has been studied by means of high-resolution powder neutron diffraction and the Rietveld analysis. It has been found that both the rhombic distortion of the CuO 4 basal plane and the change of the thermoelectric power in the TLT phase are greatest at x ∼ 0.115. Therefore, the local minimum of the superconducting transition temperature at x = 0.115 is concluded to be due to the drastic change in the electronic structure in cooperation with the large rhombic distortion of the CuO 4 basal plane in the TLT phase.
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