Low temperature scanning tunneling spectroscopy studies of high J c NdBa2Cu3O7-δ single crystals

M. Nishiyama, G. Kinoda, S. Shibata, T. Hasegawa, N. Koshizuka, M. Murakami

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report low temperature scanning tunneling spectroscopy (STS) studies on NdBa2Cu3O7-δ (Nd123) single crystals. Two characteristic spectra with a nearly ohmic background spectrum and a V-shaped background are observed on the cleaved surfaces. The former spectum shows an inhomogeneous distribution of a superconducting energy gap (2Δ) for STS differential conductance map. The latter shows a homogeneous distribution. It is probable that those differences are attributed to a tunneling current from different surface layers. The temperature dependence of tunneling conductance spectrum with a V-shaped background reveals that the superconducting gap disappears around Tc, and no pseudogap behavior exists above T c.

Original languageEnglish
Pages (from-to)351-354
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume15
Issue number5
Publication statusPublished - 2002 Dec 1

Keywords

  • NdBaCuO single crystals
  • Scanning tunneling spectroscopy
  • Superconducting energy gap

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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