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Report No.

Low-energy spectroscopic mapping studies in optimally-doped Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Cl$$_2$$

Hanaguri, Tetsuo*; Kosaka, Yuki*; Davis, J. C.*; Lupien, C.*; Yamada, Ikuya*; Azuma, Masaki*; Takano, Mikio*; Oishi, Kazuki; Takagi, Hidenori*

We performed high-resolution scanning tunneling microscopy/spectroscopy on an optimally-doped Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Cl$$_2$$ crystal. The so-called checkerboard local-density-of-state modulation manifests in the spectroscopic map of the optimally-doped sample. In addition, spatially-inhomogeneous energy gap is observed. The gap tends to be buried at elevated temperatures and correlates with the checkerboard modulation. These results suggest that the gap is related to superconductivity which coexists with the checkerboard modulation.



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Category:Physics, Applied



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