Growth of superconducting MgB2 films by pulsed-laser deposition using a Nd-YAG laser

P. Badica, K. Togano, S. Awaji, K. Watanabe

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Thin films of MgB2 on r-cut Al2O3 substrates have been grown by pulsed-laser deposition (PLD) using a Nd-YAG laser (fourth harmonic - 266 nm) instead of the popular KrF excimer laser. The growth window to obtain superconducting films is laser energy 350-450 mJ and vacuum pressure with Ar-buffer gas of 1-8/10 Pa (initial background vacuum 0. 5-1 × 10-3 Pa). Films were deposited at room temperature and post-annealed in situ and ex situ at temperatures of 500-780°C and up to 1 h. Films are randomly oriented with maximum critical temperature (offset of resistive transition) of 27 K. SEM/TEM/EDS investigations show that they are mainly composed of small sphere-like particles (≤20 nm), and contain oxygen and some carbon, uniformly distributed in the flat matrix, but the amount of Mg and/or oxygen is higher in the aggregates-droplets (100-1000 nm) observed on the surface of the film's matrix. Some aspects of the processing control and dependences on film characteristics are discussed. The technique is promising for future development of coated conductors.

Original languageEnglish
Pages (from-to)242-246
Number of pages5
JournalSuperconductor Science and Technology
Volume19
Issue number2
DOIs
Publication statusPublished - 2006 Feb 1

ASJC Scopus subject areas

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

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