Self-organized layered hydrogenation in black Mg2NiHx switchable mirrors |
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| Authors: | Lohstroh W Westerwaal R J Noheda B Enache S Giebels I A M E Dam B Griessen R |
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| Institution: | Faculty of Sciences, Department of Physics and Astronomy, Condensed Matter Physics, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands. lohstroh@nat.vu.nl |
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| Abstract: | In addition to a mirrorlike (Mg2Ni) and a transparent (Mg2NiH4) state, thin films of Mg2NiHx exhibit a remarkable black state with low reflection over the entire visible spectrum, essentially zero transmission and a low electrical resistivity. Such a black state is not explicable for a homogeneous layer since a large absorption coefficient always yields substantial reflection. We show that it results from a self-organized and reversible double layering of metallic Mg2NiH0.3 and semiconducting Mg2NiH4. |
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