Coincidence of checkerboard charge order and antinodal state decoherence in strongly underdoped superconducting Bi2Sr2CaCu2O8+δ
Coincidence of checkerboard charge order and antinodal state decoherence in strongly underdoped superconducting Bi2Sr2CaCu2O8+δ
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DOI：
10.1103/physrevlett.94.197005
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发表时间：
2005-05-20
影响因子：
8.6
通讯作者：
Davis, JC
中科院分区：
文献类型：
--
作者：
McElroy, K;Lee, DH;Davis, JC
用扫描隧道显微镜研究了Bi_2Sr_2CaCu_2O_（8 + δ）超导体的纳米尺度电子结构与掺杂的关系。在所有的掺杂，根据一个简单的准粒子干涉模型的低能态密度调制进行了分析，发现是符合费米弧超导。强欠掺杂破坏了近最佳隧穿谱中普遍存在的超导相干峰，出现了一种新的谱型。仅在展示这种新光谱的区域中，我们发现高能态的局部“棋盘”电荷排序，其中波矢量（Q）在右箭头上=（+/- 2 pi/4.5a（0），0）;（0，+/- 2 pi/4.5a（0））+/-15%。令人惊讶的是，这种高能量态的空间有序与低能量Bogoliubov准粒子态和谐共存。
The doping dependence of nanoscale electronic structure in superconducting Bi2Sr2CaCu2O8+delta is studied by scanning tunneling microscopy. At all dopings, the low energy density-of-states modulations are analyzed according to a simple model of quasiparticle interference and found to be consistent with Fermi-arc superconductivity. The superconducting coherence peaks, ubiquitous in near-optimal tunneling spectra, are destroyed with strong underdoping and a new spectral type appears. Exclusively in regions exhibiting this new spectrum, we find local "checkerboard" charge ordering of high energy states, with a wave vector of (Q) over right arrow=(+/- 2 pi/4.5a(0),0); (0,+/- 2 pi/4.5a(0))+/- 15%. Surprisingly, this spatial ordering of high energy states coexists harmoniously with the low energy Bogoliubov quasiparticle states.