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

R. J. Wijngaarden, Michael Rudolf 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 Jan 1
Externally publishedYes

Fingerprint

Faraday effect
Magnetic flux
optical microscopes
Superconducting materials
Microscopes
Visualization
Polarization
Magnetic fields
Fluxes
polarizers
Cryostats
magnetic flux
high resolution
microscopes
Optical systems
Lenses
Vortex flow
Cameras
cryostats
polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Flux visualization in high-Tc superconductors using a high-resolution magneto-optical microscope. / Wijngaarden, R. J.; Koblischka, Michael Rudolf; Griessen, R.

In: Physica C: Superconductivity and its Applications, Vol. 235-240, No. PART 4, 01.01.1994, p. 2699-2700.

Research output: Contribution to journalArticle

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