淡江大學機構典藏:Item 987654321/72590
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    題名: Effect of Sm valence changes on photoemission spectra
    作者: denBoer, M. L.;Chang, C.L.;Horn, S.;Murgai, V.
    貢獻者: 淡江大學物理學系
    日期: 1988-04
    上傳時間: 2013-07-09 15:09:02 (UTC+8)
    出版者: College Park: American Physical Society
    摘要: We have used low-energy (hν=17–45 eV) photoemission to study thin films of Sm evaporated on Nb. We find that Sm evaporated onto a room-temperature Nb substrate is initially entirely divalent. On a time scale of the order of 50 min at room temperature a valence transition to mixed-valent or trivalent Sm occurs. This is accompanied by dramatic changes in the photoemission spectra, including a large increase in the total yield of photoelectrons and the appearance of a series of new constant-kinetic-energy peaks. The photon-energy dependence of these peaks indicates that they are due to Auger recombination of the Sm 5p level. We also observe a 5p→5d resonance in Sm for the first time. The underlying cause of these effects appears to be an ordering transition in the Sm film, which changes the Sm 5d occupancy and increases the resonance amplitude. This mechanism is evidently a very sensitive indicator of a Sm valence change.
    關聯: Physical Review B (Condensed Matter) 37(12), pp.6605-6610
    DOI: 10.1103/PhysRevB.37.6605
    顯示於類別:[物理學系暨研究所] 期刊論文

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