Deuterium-induced volume expansion in Fe0.5V0.5/V superlattices

Gunnar K. Pálsson, Vassilios Kapaklis, Joseph A. Dura, Julie Jacob, Sumedha Jayanetti, Adrian R. Rennie, and Björgvin Hjörvarsson
Phys. Rev. B 82, 245424 – Published 16 December 2010

Abstract

Neutron reflectometry was used to investigate the deuterium uptake in a thin metal superlattice that displays an anisotropic elastic response [Fe0.5V0.5/V (6/21 monolayers)]. We see evidence of the presence of a coexistence region which has never before been seen in vanadium-based superlattices. The loading process is completely reversible from which we conclude that the phases must be coherent, in stark contrast to bulk VDx, where the two-phase region displays hysteresis. The deuterium-induced volume expansion exhibits changes in slope that correlate with the plateau region and the expansion is comparable and even larger than in the bulk. The spectacular cooperation between the elastic fields seems to be found only in one-dimensionally confined structures with biaxial compressive strain states.

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  • Received 22 September 2010

DOI:https://doi.org/10.1103/PhysRevB.82.245424

©2010 American Physical Society

Authors & Affiliations

Gunnar K. Pálsson1, Vassilios Kapaklis1, Joseph A. Dura2, Julie Jacob1, Sumedha Jayanetti1,3, Adrian R. Rennie1, and Björgvin Hjörvarsson1

  • 1Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden
  • 2NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 6102, Gaithersburg, Maryland 20899-6102, USA
  • 3Department of Physics, University of Colombo, Box 1490, Colombo, Sri Lanka

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Issue

Vol. 82, Iss. 24 — 15 December 2010

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