Abstract
A structural transition to a low-temperature tetragonal (TLT) phase occurs below T d2≈60 K in La 2− x Ba x CuO 4 only around x=0.125, accompanied by sharp suppression of superconductivity. In this study we investigated the effects of partial substitution of smaller divalent cations for Ba 2+ ions ( Ba 2+ > Sr 2+ > Ca 2+) on these anomalous low-temperature properties. The suppression of superconductivity is strongly affected by the appearance of the TLT phase for this carrier concentration. We also show that the variations of T d2 and T c are quantitatively scaled by the averaged size of cations at the La site. This dependence can be interpreted as chemical effects acting effectively as applied pressure. We discuss how our observation is related to recent reports which claim that the TLT structure itself does not necessarily destroy the superconductivity.
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