Anomalous momentum dependence of the superconducting coherence peak and its relation to the pseudogap of La1.85Sr0.15CuO4.
Anomalous momentum dependence of the superconducting coherence peak and its relation to the pseudogap of La1.85Sr0.15CuO4.
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DOI：
10.1103/physrevlett.99.017003
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发表时间：
2007-07
影响因子：
8.6
通讯作者：
K. Terashima;Hideki Matsui;Takafumi Sato;Tetsuo Takahashi;M. Kofu;M. Kofu;M. Kofu;Kazuma Hirota
中科院分区：
文献类型：
--
作者：
K. Terashima;Hideki Matsui;Takafumi Sato;Tetsuo Takahashi;M. Kofu;M. Kofu;M. Kofu;Kazuma Hirota
我们进行了高分辨率的角度分辨光电子能谱的La 1.85 Sr 0.15 CuO 4的单粒子激发间隙的性质进行了研究。我们发现在非结区有一个明确的超导相干峰，而在波腹附近它被强烈抑制。的单粒子激发间隙的动量依赖性显示出显着的偏离dx-y2-波对称性与异常增强的反节点周围的超导和赝能隙状态。观察到的超导相干峰和赝能隙之间的密切相关性表明，在超导状态下的差距的异常行为的赝能隙的实质性贡献。
We performed high-resolution angle-resolved photoemission spectroscopy on La1.85Sr0.15CuO4 to study the nature of the single-particle excitation gap. We found that there is a well-defined superconducting coherence peak in the off-nodal region while it is strongly suppressed around the antinode. The momentum dependence of the single-particle excitation gap shows a striking deviation from the dx-y2--wave symmetry with anomalous enhancement around the antinode in both the superconducting and the pseudogap state. The observed close correlation between the superconducting coherence peak and the pseudogap suggests a substantial contribution of the pseudogap to the anomalous behavior of the gap in the superconducting state.