ANGLE-SCANNED PHOTOEMISSION ONYbHx: RELEVANCE FOR SWITCHABLE MIRRORS

J. Hayoz, C. Koitzsch, D. Popović, M. Bovet, D. Naumović and P. Aebi
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J. Hayoz: Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland
C. Koitzsch: Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland
D. Popović: Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland
M. Bovet: Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland
D. Naumović: Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland
P. Aebi: Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland

Surface Review and Letters (SRL), 2002, vol. 09, issue 01, 235-241

Abstract: Yttrium, lantanum and rare earth elements can be loaded with hydrogen inducing a metal–insulator transition and giving rise to optical switching from reflecting to transparent. We present angle-scanned photoemission experiments characterizing thinYbHxfilms grown on W(110) at room temperature. Hydrogen loading is performed in an ultrahigh-vacuum-compatible high pressure (1 bar) reaction cell. Via full-hemispherical X-ray photoelectron diffraction and low energy electron diffraction, it is demonstrated that these films grow well-ordered and single-crystalline. Ultraviolet photoemission reveals a gap for the dihydride phase confirming a transition from reflecting to transparent as seen by visual inspection. Ion implantation through additional H+ sputtering allows one to increase the hydrogen content tox ≈ 2.4.

Date: 2002
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DOI: 10.1142/S0218625X02001719

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