Measurement of the vortex-core radius by scanning tunneling microscopy


Hartmann, U. and Golubov, A.A. and Drechsler, T. and Kupriyanov, M. Yu. and Heiden, C. (1994) Measurement of the vortex-core radius by scanning tunneling microscopy. Physica B: Condensed Matter, 194-19 (1-3). pp. 387-388. ISSN 0921-4526

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Abstract:Using a scanning tunneling microscope operated in a spectroscopic mode we imaged flux-line lattices in niobium diselenide at various external magnetic fields. From the evaluation of a large number of tunneling-current profiles taken across the individual vortices we deduced the dependence of the vortex-code radius on the applied magnetic field. It was found that the core radius shows a pronounced decrease with increasing field, even for H/Hc2<<1. This behavior is qualitatively well characterized by self-consistent solutions of the Usadel equations.
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Copyright:© 1994 Elsevier Science
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