Isotope Effects in Switchable Metal-Hydride Mirrors


Gogh, A.T.M. van and Kooij, E.S. and Griessen, R. (1999) Isotope Effects in Switchable Metal-Hydride Mirrors. Physical Review Letters, 83 (22). pp. 4614-4617. ISSN 0031-9007

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Abstract:Measurements of optical reflectance, transmittance, and electrical resistivity on the switchable mirror systems YHx and YDx show that the absorption of hydrogen induces the same variations as that of deuterium. In both cases there is a weak transparency window for the metallic dihydride (dideuteride) phase and a yellowish transparency in the insulating trihydride (trideuteride) phase. The slightly higher electrical resistivity of the deuterides is related to the lower energy of their optical phonons. The absence of significant isotope effects in the optical properties of YHx(YDx) is at variance with Peierls-like theoretical models. It is, however, compatible with strong electron correlation models
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Copyright:© 1999 The American Physical Society
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