Fourfold structure of vortex-core states in Bi2Sr2CaCu2O8+delta.
Fourfold structure of vortex-core states in Bi2Sr2CaCu2O8+delta.
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DOI：
10.1103/physrevlett.95.257005
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发表时间：
2005-03
影响因子：
8.6
通讯作者：
G. Levy;M. Kugler;A. Manuel;O. Fischer;Ming Li
中科院分区：
文献类型：
--
作者：
G. Levy;M. Kugler;A. Manuel;O. Fischer;Ming Li
我们使用低温扫描隧道显微镜对稍微过量掺杂的 Bi2Sr2CaCu2O8+δ 中的涡核光谱进行了详细研究。在涡核内部，我们观察到局域态密度的四重对称调制，其能量无关周期为 (4.3 +/- 0.3)a0。此外，我们证明这种平方调制与位于 +/-6 meV 的涡核态有关。由于核心态能量与超导能隙大小成正比，因此我们的结果强烈表明超导态与涡核中的局部电子调制之间存在直接关系。
We present a detailed study of vortex-core spectroscopy in slightly overdoped Bi2Sr2CaCu2O8+delta using a low-temperature scanning tunneling microscope. Inside the vortex core, we observe a fourfold symmetric modulation of the local density of states with an energy-independent period of (4.3 +/- 0.3)a0. Furthermore, we demonstrate that this square modulation is related to the vortex-core states which are located at +/-6 meV. Since the core-state energy is proportional to the superconducting gap magnitude , our results strongly suggest the existence of a direct relation between the superconducting state and the local electronic modulations in the vortex core.