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Field penetration and field electron emission from HTSC materials
Author(s) -
Uimanov I. V.
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1897
Subject(s) - field electron emission , electron , band bending , field (mathematics) , condensed matter physics , penetration (warfare) , penetration depth , superconductivity , physics , common emitter , materials science , quantum mechanics , optoelectronics , mathematics , operations research , pure mathematics , engineering
This paper discusses field penetration into high‐ T c cuprates under field electron emission conditions. A quasi‐classical approximation based on Thomas–Fermi non‐linear screening theory has been used to discuss field penetration into a high‐ T c superconductor (HTSC) emitter, taking into account the HTSC electronic structure. The numerical results obtained are substantially different from the predictions of linear theory. The results show that, for a screening length of several angströms and field strengths typical of field electron emission spectroscopy, the amount of band‐bending can be comparable with the total width of the band. Thus, the effects of field penetration and band‐bending should be taken into account when constructing a theory of field emission from these compounds. Copyright © 2004 John Wiley & Sons, Ltd.