Nonmonotonic evolution and thermodynamic trends at metal/(Hg,Cd)Te interfaces: Yb/Hg0.78Cd0.22Te

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Abstract
The microscopic interaction of cleaved Hg0.78Cd0.22Te surfaces with the highly reactive rare earth Yb was studied by use of photoemission spectroscopy and synchrotron radiation. We compare the results of this study with our previous investigation of Sm/(Hg,Cd)Te interface formation. Yb and Sm are similar in their initial stage of interface formation: rapid attenuation and near loss of the Hg emission is followed by its dramatic recovery. However, differences in valency between Sm and Yb develop during metal deposition and subsequently lead to differences in interface morphology. Calculated heats of solution are shown to correlate with the different behaviors observed during rare earth/(Hg,Cd)Te interface formation.

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