Supermodulus effect in a Au/Ni superlattice studied by a diamond anvil cell and SR x ray

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Abstract
Elastic and thermal properties of Au/Ni superlattices have been investigated by x‐ray diffraction on a synchrotron radiation source at the Photon Factory. An elastic response of [Au(10 Å)/Ni(10 Å)]50 to hydrostatic pressure generated by a diamond anvil cell has been measured in the layer‐stacking direction. Its compressibility obtained from the pressure dependence of its superlattice period (Λ vs P) shows an anomalously small value compared with either bulk Au or Ni metal. Linear thermal expansions has also been measured by a similar method (Λ vs T). A significant anisotropic behavior between the layer‐stacking and in‐plane direction was found in both [Au(10 Å)/Ni(10 Å)]50 and [Au(4 Å)/Ni(4 Å)]210.