Abstract
In order to investigate the origin of the so‐called 1/8‐anomaly in high‐Tc La(Sr,Ba)‐214, we have carried out the measurements of electric resistivity, magnetic susceptibility and muon spin relaxation (μSR) for the samples La2−x−yEuySrxCuO4. Eu(y=0.1)‐substitution stabilizes a low temperature tetragonal (LTT) phase and consequently, around x=0.125 (1/8) the magnetic ordering temperature Tm shows the maximum value while the superconducting critical temperature Tc is most suppressed, indicating a strong competition between them, and over the whole x range Tc are entirely lowered. On the other hand, with increasing y up to y∼0.05 at x=0.125 (1/8), Tm steeply increases and Tc rapidly decreases, indicating transition to LTT, but both the temperatures gradually decrease in LTT phase above y∼0.05. In all Eu‐substituted samples, the resisitivity upturn is observed at low temperature, implying carrier localization. The anomalous suppression of Tc in Eu‐substituted LSCO can be attributed to the strong carrier local...
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