Scanning tunneling microscope studies on the atomic structures in NdBa2Cu3O7-δ single crystals

M. Nishiyama, N. Chikumoto, M. Murakami, K. Ogawa

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

Atomic and electronic structures of the cuprate NdBa2Cu3O7-δ, which is processed by the oxygen-controlled-melt-growth (OCMG) method, have been studied by scanning tunneling microscopy/spectroscopy (STM/STS). Two characteristic microstructures, namely, island and striped structures have been observed, the latter for the first time. The former is a well-known pinning center in OCMG Nd123. The islands are of a couple of tens of nanometers in size and are found to be less conductive than the embedding matrix. Three types of stripes, namely, regular, spotted and irregularly spaced ones, have been observed. The stripe consists of lines of bright contrast and of a few atom rows running parallel to and between the neighboring lines of bright contrast. The striped band is more conductive than the matrix. The striped and flat bands of a couple of tens of nanometers wide each are found to be arranged alternately. We suggest the striped structure to be a good candidate for another strong pinning center in OCMG Nd123.

Original languageEnglish
Pages (from-to)251-258
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume335
Issue number1
DOIs
Publication statusPublished - 2000 Jun
Externally publishedYes
Event9th Japan-US Workshop on High-Tc Superconductors - Yamanashi, Jpn
Duration: 1999 Oct 131999 Oct 15

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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