Electron momentum distribution of icosahedral Cd84Yb16 studied by Compton scattering

T. Okada, Y. Watanabe, S. Nanao, R. Tamura, S. Takeuchi, Y. Yokoyama, N. Hiraoka

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The electron momentum distribution in icosahedral Cd84Yb16 has been studied using the high-resolution Compton scattering technique with a momentum resolution of 0.16 a.u. The experimental valence-electron Compton profile is decomposed into two components: an inverted parabolalike one and a broad Gaussian-like one. We have found that the Fermi sphere, deduced from the number of electrons under the inverted parabolalike component, just coincides with the quasi-Brillouin zones constructed from the intense (211111) and (221001) reciprocal points. The Gaussian-like part is attributed to the electron occupation of the Yb 5d states. These facts are taken as signature that both the Hume-Rothery mechanism and the sp−d hybridization mechanism contribute to the formation of the pseudogap, stabilizing the icosahedral phase of Cd84Yb16.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
Publication statusPublished - 1 Jan 2003

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