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Gap distribution in overdoped La2−xSrxCuO4 observed by scanning tunneling spectroscopy

✍ Scribed by T. Kato; T. Noguchi; R. Saito; T. Machida; H. Sakata

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
146 KB
Volume
460-462
Category
Article
ISSN
0921-4534

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✦ Synopsis

Low-temperature scanning tunneling spectroscopy on the highly overdoped La 1.78 Sr 0.22 CuO 4 (T c = 27 K) single crystal reveals gap inhomogeneity at 4.2 K. The energy gap D observed in the tunneling spectra distributes around 7 meV: it ranges from 4 to 20 meV. The spectra with smaller D (4-10 meV) exhibit gap edge peaks and flat background density-of-states, which is general characteristics of the overdoped cuprate high-temperature superconductors. On the other hand, the spectra with D exceeding 10 meV shows broad feature without clear gap edge peaks.

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