Appearance of New Energy Gap and Periodic Local Density-of-States Modulation in $B{i}_{2}S{r}_{1.6}L{a}_{0.4}Cu{O}_{6+\delta }$

Abstract

The spatial variation of the local density of states in optimally doped Bi${}_2$Sr${}_{1.6}$La${}_{0.4}$CuO${}_{6+\delta }$ (superconducting transition temperature is 34 K) is studied by scanning tunneling spectroscopy at 4.2 K in zero magnetic field. Two-dimensional density-of-states modulation aligned with the Cu-O-Cu bond with a periodicity of about five lattice constants is observed. It is found that this modulation accompanies the appearance of a new energy gap of approximately 10 meV, whose gap edge peak is spatially modulated in intensity. This gap coexists with the superconducting gap, the value of which ranges from 10 meV to 60 meV.

arXiv comment9 pages, 5 figures, J. Phys. Soc. Jpn accepted

References in corpus (15)

• Destruction of the Fermi Surface in Underdoped High Tc Superconductors
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• Measurement of an Anisotropic Energy Gap in Single Plane Bi_2Sr_(2-x)La_xCuO_(6+d)
• Evolution of a Metal to Insulator Transition in Ca${}_{2-x}$Na${}_x$CuO${}_2$Cl${}_2$, as seen by ARPES
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• Local Measurement of Microwave Response with Local Tunneling Spectra Using Near Field Microwave Microscopy
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