Superconducting volume fraction in overdoped regime of La2-xSrxCuO4:: Implication for phase separation from magnetic-susceptibility measurement
Superconducting volume fraction in overdoped regime of La2-xSrxCuO4:: Implication for phase separation from magnetic-susceptibility measurement
复制标题
DOI：
10.1143/jpsj.74.2893
复制
发表时间：
2005-11-01
影响因子：
1.7
通讯作者：
Koike, Y
中科院分区：
文献类型：
--
作者：
Tanabe, Y;Adachi, T;Koike, Y
我们生长了Sr浓度x在过掺杂范围内从0.24到0.29连续变化的Lag（2-x）Sr（x）CuO（4）单晶，并通过切割单晶获得了许多具有不同x值的单晶片。从每个片的磁化率，chi的详细测量，已经发现，在测量的最低温度2K，垂直棒chi（2K）垂直棒，在场冷却时，chi的绝对值随着x的增加以及超导（SC）转变温度的增加而迅速减小。由于竖线χ（2K）竖线的值被认为对应于样品中的SC体积分数，因此已经得出结论，在过掺杂区域中，在La 2-xSrxCuO 4的样品中发生相分离成SC和正常态区域。
We have grown a single crystal of Lag(2-x)Sr(x)CuO(4) in which the Sr concentration, x, continuously changes from 0.24 to 0.29 in the overdoped regime and obtained many pieces of single crystals with different x values by slicing the single crystal. From detailed measurements of the magnetic susceptibility, chi, of each piece, it has been found that the absolute value of chi at the measured lowest temperature 2K, vertical bar chi(2K)vertical bar, on field cooling rapidly decreases with increasing x as well as the superconducting (SC) transition temperature. As the value of vertical bar chi(2K)vertical bar is regarded as corresponding to the SC volume fraction in a sample, it has been concluded that a phase separation into SC and normal-state regions occurs in a sample of La2-xSrxCuO4 in the overdoped regime.