Coexistence of Competing Orders with Two Energy Gaps in Real and Momentum Space in the High Temperature Superconductor Bi2Sr2-xLaxCuO6+δ
Coexistence of Competing Orders with Two Energy Gaps in Real and Momentum Space in the High Temperature Superconductor Bi2Sr2-xLaxCuO6+δ
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DOI：
10.1103/physrevlett.101.207002
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发表时间：
2008-11-14
影响因子：
8.6
通讯作者：
Madhavan, V.
中科院分区：
文献类型：
--
作者：
Ma, J. -H.;Pan, Z. -H.;Madhavan, V.
通过扫描隧道显微镜和角分辨光电子能谱的研究，在Bi（2）Sr（2-x）La（x）CuO（6+delta）的超导转变温度（T（c））以下，我们观测到了两个不同的能隙（一个小的能隙和一个大的能隙），它们同时存在于真实的空间和动量空间的波腹区域.我们表明，小间隙与超导性。大间隙持续高于T（c），似乎与观察到的电荷排序。我们发现大的和小的差距之间有很强的相关性，这表明它们受到类似的物理过程的影响。
Through a combined scanning tunneling microscopy and angle-resolved photoemission spectroscopy study, we report the observation of two distinct gaps (a small and a large gap) that coexist both in real space and in the antinodal region of momentum space, below the superconducting transition temperature (T(c)) of Bi(2)Sr(2-x)La(x)CuO(6+delta). We show that the small gap is associated with superconductivity. The large-gap persists above T(c), and seems linked to observed charge ordering. We find a strong correlation between the large and small gaps suggesting that they are affected by similar physical processes.