Recoil-Free Fraction of ^197Au Mossbauer Resonance in Au (1 nm)/Ni (1 nm) Multilayer

概要

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^197Au Mossbauer measurements have been performed for Au(1 nm)/Ni(1 nm) multilayer stacked on pure Au buffer layer (25 nm in thickness) at 75, 50, 25 and 11 K. Au atom ratio in multilayer and buffer layer has been prepared to be 2 : 1 ; however, the area ratio in ^197Au Mossbauer spectrum, which is a superposition of multilayer and buffer-layer components, has been determined to be 3. 2 : 1 in a thin-foil approximation at 11 K suggesting larger recoil-free fraction of ^197Au in multilayer than that in Au buffer layer. Temperature dependence of the area ratio has been analyzed using a Debye model and the Debye temperature of ^197Au in this multilayer has been determined to be 230±20K, which is much higher than 164 K of bulk Au metal, suggesting the existence of the supermodulus effect in this multilayer.
社団法人日本物理学会の論文
1995-04-15