d-wave anisotropy and coexistence of the superconducting gap and pseudogap inLa2−xSrxCuO4/Agjunctions
d-wave anisotropy and coexistence of the superconducting gap and pseudogap inLa2−xSrxCuO4/Agjunctions
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La2−xSrxCuO4/Ag结中d波各向异性以及超导能隙和赝能隙的共存
DOI：
10.1103/physrevb.68.214520
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
I. Iguchi
中科院分区：
文献类型：
--
作者：
T. Miyake;T. Imaizumi;I. Iguchi
我们提出了 La 2 - x Sr x CuO 4 (LSCO)/Ag 结的角度分辨隧道光谱。观察到的隧道电导曲线显示，接近最佳掺杂样品的超导间隙 (SG) 为 9'1 mV，而欠掺杂样品的超导间隙 (SG) 为 11'1 mV。它们还表现出电导在几十 mV 处大幅下降，对应于零角和有限角结可能的赝间隙 (PG)。此外，对于有限角度结，可以观察到零偏置电导峰值（ZBCP）。同时观察SG。 PG和ZBCP意味着LSCO的超导能隙和赝能隙与d波阶次参数共存。
We present the angle-resolved tunneling spectroscopy of La 2 - x Sr x CuO 4 (LSCO)/Ag junctions. The observed tunnel conductance curves show the superconducting gap (SG) at 9′1 mV for the near optimally doped samples and at11′1 mV for the underdoped samples. They also show strong decrease of conductance at a few tens of mV corresponding to the possible pseudogap (PG) for zero- and finite-angle junctions. Besides, the zero bias conductance peak (ZBCP) is observable for finite-angle junctions. The simultaneous observation of SG. PG, and ZBCP implies the coexistence of superconducting gap and pseudogap with the d-wave order parameter for LSCO.