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Spontaneous Dipole Alignment in Films of N2O

Richard Balog, P. Cicman, N. C. Jones, and D. Field
Phys. Rev. Lett. 102, 073003 – Published 18 February 2009

Abstract

Experimental data obtained using low energy electron beams are presented which show that films of N2O, of several hundred monolayers (ML), spontaneously acquire a positive potential of as high as 5 V. Films do not possess a dipole double layer but for >40ML display a constant electric field within the material. This new phenomenon is attributed to dipole alignment. The phenomenon also shows a strong temperature dependence. This is revealed by the differing dependence of the surface potential on the film thickness at different temperatures and by electron transmission spectra which display marked structure at 62 K which is absent at 40 K.

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  • Received 11 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.073003

©2009 American Physical Society

Authors & Affiliations

Richard Balog, P. Cicman, N. C. Jones, and D. Field*

  • Department of Physics and Astronomy, and Institute for Storage Ring Facilities, University of Aarhus, 8000 Aarhus C, Denmark

  • *Corresponding author. dfield@phys.au.dk

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Issue

Vol. 102, Iss. 7 — 20 February 2009

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