STM/STS studies on the energy gap of Pb-substituted Bi2Sr 2CuO6+δ in magnetic fields

K. Kudo, T. Nishizaki, D. Okamoto, N. Okumura, N. Kobayashi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The tunneling spectrum of high-Tc cuprates simultaneously exhibits kinks (or peaks) at low energy and peaks at high energy, suggesting the existence of two energy gaps. In order to clarify origins of these two gaps, we have performed the scanning tunneling microscopy/spectroscopy of the slightly overdoped Pb-substituted Bi2Sr2CuO6+δ (Pb-Bi2201) (Tc∼20K) in magnetic fields. In zero field, almost all tunneling spectra exhibit clear peaks. In many cases, two peaks are simultaneously found around 10 mV and above 20 mV in each tunneling spectrum. By the application of the magnetic field of 7 T, peaks around 10 mV are strongly suppressed, but ones above 20 mV are not changed. The result indicates that peaks around 10 mV and above 20 mV possibly correspond to the superconducting gap and the pseudogap, respectively.

Original languageEnglish
Pages (from-to)S195-S196
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

Keywords

  • Pb-substituted Bi2201
  • Scanning tunneling microscopy/spectroscopy
  • Two gaps

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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