Flux visualization in high-Tc superconductors using a high-resolution magneto-optical microscope

R. J. Wijngaarden, M. R. Koblischka, R. Griessen

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report on the first observations of magnetic flux structures in high-Tc superconductors using a newly designed low temperature polarization microscope. Magnetic flux in the superconductor is visualized by detecting the rotation of the polarization vector of light (Faraday effect) within a magneto-optically active EuSe layer which is evaporated onto the surface of the sample. The low temperature microscope as a whole is built as an insert into a commercial cryostat equipped with a superconducting coil, enabling us to achieve magnetic fields up to 7 T. The optical system (lenses, polarizers and translation table) is cooled together with the sample in order to minimize the distance between the sample and the objective. Key properties are a large numerical aperture, a high extinction ratio of the polarizers and a high sensitivity of the image-intensified camera system. This should allow in the near future the visualization of individual vortices using the Faraday effect in transmission in low magnetic fields.

Original languageEnglish
Pages (from-to)2699-2700
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume235-240
Issue numberPART 4
DOIs
Publication statusPublished - 1994 Dec
Externally publishedYes

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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