Doping Dependence of Two Energy Scales in the Tunneling Spectra of Superconducting La$_{2-x}$Sr$_{x}$CuO$_{4}$

Details Doping Dependence of Two Energy Scales in the Tunneling Spectra of Superconducting La$_{2-x}$Sr$_{x}$CuO$_{4}$ Doping Dependence of Two Energy Scales in the Tunneling Spectra of Superconducting La$_{2-x}$Sr$_{x}$CuO$_{4}$

2008-03-10

arxiv.org/abs/0803.1415v3

J. Phys. Soc. Jpn. 77, 054710 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, to be published in J. Phys. Soc. Jpn Vol.77 No.5

Scientific paper

10.1143/JPSJ.77.054710

Scanning tunneling microscopy and spectroscopy have been performed on superconducting La$_{2-x}$Sr$_{x}$CuO$_{4}$ ($x=0.06, 0.12, 0.16$, and 0.21) at 4.2 K. Atomically resolved surface topography has been observed on the $ab$ surface, which exhibits a one-dimensional structure corresponding to the buckling pattern of the orthorhombic phase. The tunneling spectra of all samples exhibit kinks at about $\pm 5$ meV in addition to the energy gap, indicating the existence of two energy scales. While the gap magnitude varies on the length scale of a few nm and steadily increases upon underdoping, the kink energy is spatially uniform on the surface and almost independent of the doping level.

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