Nanostripe structures in SmBa2Cu3Ox superconductors

Michael Rudolf Koblischka, M. Winter, U. Hartmann

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Atomic force microscopy and scanning tunnelling microscopy scans of SmBa2Cu3Ox (Sm123) high-Tc superconductors (single crystals and melt-textured samples) prepared using different growth techniques revealed the presence of nanoscale stripe-like structures, which are found to be sometimes parallel over several micrometres and sometimes wavy. These structures consist of chemical compositional fluctuations inherent to the light rare earth high-Tc superconductors and may act as effective pinning centres due to their periodicity of typically 10-60nm which is comparable to the ideal pinning centre size 2ξ (∼10nm for YBa2Cu3Ox in the ab-plane). Nanostripes are observed in Sm123 single crystals grown by the top-seed pulling technique and in melt-textured samples. The periodicity of the nanostripes is found to be much larger (∼50nm) in the former samples than in the melt-textured samples (10-25nm). Detailed measurements reveal that the nanostripes are formed by chains of individual nanoclusters formed from unit cells of the Sm-rich phase, Sm1+xBa2-xCu3Oy. The control of these pinning structures running throughout the whole sample volume may be a key to improving critical current densities, especially at high external magnetic fields.

Original languageEnglish
Article number016
Pages (from-to)681-686
Number of pages6
JournalSuperconductor Science and Technology
Volume20
Issue number7
DOIs
Publication statusPublished - 2007 Jul 1
Externally publishedYes

Fingerprint

Superconducting materials
Single crystals
Nanoclusters
Scanning tunneling microscopy
Rare earths
Seed
Atomic force microscopy
Magnetic fields
periodic variations
single crystals
pulling
nanoclusters
micrometers
scanning tunneling microscopy
seeds
critical current
rare earth elements
atomic force microscopy
current density
cells

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Nanostripe structures in SmBa2Cu3Ox superconductors. / Koblischka, Michael Rudolf; Winter, M.; Hartmann, U.

In: Superconductor Science and Technology, Vol. 20, No. 7, 016, 01.07.2007, p. 681-686.

Research output: Contribution to journalArticle

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