Electron Microscopy Study on Magnetic Flux Lines in Superconductors: Memorial to Akira Tonomura

Author

Harada, Kanako ; Osakabe, N. ; Ono, Y.A.

Author_Institution

Hitachi Central Res. Lab., Hatoyama, Japan

Volume

23

Issue

1

fYear

2013

fDate

Feb. 2013

Firstpage

8000507

Lastpage

8000507

Abstract

Using electron holography and coherent beam Lorentz microscopy, Akira Tonomura investigated the physics of magnetic flux lines, or vortices, in metal and high-temperature superconductors for more than 20 years. The methodology he developed for doing this made use of coherent electron waves from cold-emission (field-emission) sources and their quantum-mechanical phase shifts. Using 300-kV and 1-MV electron microscopes, Tonomura and his team clarified the dynamic behavior of magnetic flux lines in Pb and Nb superconductors and in high-temperature YBa₂Cu₃O_7-δ and Bi₂Sr₂CaCu₂O_{8 + δ} superconductors. This memorial paper reviews the static and dynamic flux-line behaviors in superconductors as revealed by their results.

Keywords

barium compounds; bismuth compounds; calcium compounds; electron holography; field emission electron microscopy; high-temperature superconductors; lead; magnetic flux; niobium; optical vortices; strontium compounds; yttrium compounds; Akira Tonomura; Bi₂Sr₂CaCu₂O_8+δ; Nb; Pb; YBa₂Cu₃O_7-δ; coherent beam Lorentz microscopy; coherent electron wave; cold-emission source; electron holography; electron microscopy study; field-emission source; high-temperature superconductor; magnetic flux line; metal superconductor; quantum-mechanical phase shift; voltage 1 MV; voltage 300 kV; vortices; Electron microscopy; Magnetic domains; Magnetic flux; Magnetic force microscopy; Magnetic resonance imaging; Superconducting magnets; Electron holography; Lorentz microscopy; electron microscopy; magnetic flux lines; superconductivity; vortex;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2012.2232924

Filename

6412811