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CR30 - Vortex Matter Research Using Electron Microscopy: Memorial to Akira Tonomura

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Vortex Matter Research Using Electron Microscopy: Memorial to Akira Tonomura

Ken Harada1, Nobuyuki Osakabe2, and Yoshimasa A. Ono3

1Hitachi Central Research Laboratory, Hatoyama, Saitama 350-0395, Japan
2Hitachi Central Research Laboratory, Kokubunji, Tokyo 185-8601, Japan
3FIRST Tonomura Project, Japan Science and Technology Agency, Hatoyama,
Saitama 350-0395, Japan
e-mail: ken.harada.fz@hitachi.com, nobuyuki.osakabe.hu@hitachi.com,
yoshimasa.a.ono@gauge.jst.go.jp

Abstract - Using electron holography and “coherent beam” Lorentz microscopy, Akira Tonomura studied vortex physics in metal and high-temperature superconductors for more than 20 years. The new methodology he introduced involved 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 collaborators studied dynamic behavior of vortices in metal superconductors, Pb and Nb, and in high-temperature superconductors, YBa2Cu3O7-δ and Bi2Sr2CaCu2O8 . In this memorial paper for Akira Tonomura the static and dynamic vortex behavior in superconductors is reviewed based on the group’s results.

Keywords - vortex, superconductivity, electron holography, Lorentz microscopy

Received: July 15, 2012; Accepted July 25, 2012 .
Reference No CR30; Categories 1, 2, 4.