Imaging of vortex configurations in thin films by scanning-tunneling microscopy | Zendy

G. J. C. van Baarle | Zendy; A. Troianovski | Zendy; Terukazu Nishizaki | Zendy; P. H. Kes | Zendy; J. Aarts | Zendy

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Imaging of vortex configurations in thin films by scanning-tunneling microscopy

Author(s) -

G. J. C. van Baarle,

A. Troianovski,

Terukazu Nishizaki,

P. H. Kes,

J. Aarts

Publication year - 2003

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1554481

Subject(s) - vortex , condensed matter physics , scanning tunneling microscope , superconductivity , passivation , materials science , lattice (music) , thin film , hexagonal crystal system , quantum tunnelling , type ii superconductor , nanotechnology , physics , layer (electronics) , chemistry , crystallography , acoustics , thermodynamics

We report on imaging of vortices in thin superconducting films using surface passivation with an ultrathin Au layer. This allows investigation of surfaces that oxidize easily, as well as the mounting of samples in air. We studied vortex configurations in a material with weak vortex pinning (a-Mo2.7Ge) and a strongly pinning material (NbN) at 4.2 K in magnetic fields up to 1.4 T. In a-Mo2.7Ge, we observe a well-ordered hexagonal lattice, with local defects beginning to appear around 1.0 T. In NbN, the vortex lattice is fully disordered.

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