Photoinduced nanodots and pinning effects in Bi2Sr2CaCu2O8+d

M. Osada, M. Kakihana, H. Yasuoka, M. Käll, L. Börjesson

Research output: Contribution to journalArticle

Abstract

We report a fabrication of high-density nanodots by photodoping in overdoped Bi2Sr2CaCu2O8+d thin film (Tc = 80 K). A scanning near-field optical microscope probe is used to locally excite carrier and photodoped region is associated with lower Tc phase (Tc = 75 K) via overdoping. Nanoscale characterizations with optical reflectivity reveal that nanodots (30-nm-diameter) are regularly distributed in 50 nm step. The resultant films with photoinduced nanodots enhance Jc (at least 5 times larger than the initial one), a situation being similar to strong pinning effects observed in films modified by either ion irradiation or sputtered nanoparticles. These results suggest that photoinduced nanodots with lower Tc act as effective pinning centers.

Original languageEnglish
Pages (from-to)443-446
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume445-448
Issue number1-2
DOIs
Publication statusPublished - 2006 Oct 1
Externally publishedYes

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Keywords

  • BiSrCaCuO
  • Nanodots
  • Photoinduced effect
  • Pinning effect

ASJC Scopus subject areas

  • Condensed Matter Physics

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