Science. 1987 Mar 13;235(4794):1373-6. doi: 10.1126/science.235.4794.1373.
Structural, magnetic, and electronic properties of compounds in the series La2-xSrx CuO4-y for 0.05 </= x </= 1.1, with deltax = 0.025, were studied. Resistance, susceptibility, Meissner, and shielding measurements have revealed superconductivity among several members of the series. For x = 0.15, the transition temperature T(c), measured at the midpoint of the resistive transition, is a maximum at 39.3 K with a width of 2 K. At other compositions the transition is broader and occurs at a lower temperature. Annealing the x = 0.15 sample in oxygen at 500 degrees C increases T(c) to 40.3 K, while annealing at the same temperature under vacuum suppresses the superconductivity. These changes in oxygen content and T(c) are reversible.
研究了系列 La2-xSrx CuO4-y 中化合物的结构、磁性和电子特性，其中 0.05 </= x </= 1.1，且 deltax = 0.025。电阻、磁化率、迈斯纳和屏蔽测量显示该系列中的几个成员具有超导性。对于 x = 0.15，在电阻转变中点测量的转变温度 T(c)在 39.3 K 时达到最大值，宽度为 2 K。在其他组成下，转变更宽，发生在较低的温度。在 500 摄氏度下将 x = 0.15 样品在氧气中退火会将 T(c)提高到 40.3 K，而在相同温度下在真空中退火会抑制超导性。这些氧含量和 T(c)的变化是可逆的。
