教師資料查詢 | 類別: 期刊論文 | 教師: 張經霖 CHANG, HENRY CHING-LIN (瀏覽個人網頁)

標題:Effect of Sm valence changes on photoemission spectra
學年76
學期2
出版(發表)日期1988/04/01
作品名稱Effect of Sm valence changes on photoemission spectra
作品名稱(其他語言)
著者denBoer, M. L.; Chang, C.L.; Horn, S.; Murgai, V.
單位淡江大學物理學系
出版者College Park: American Physical Society
著錄名稱、卷期、頁數Physical Review B (Condensed Matter) 37(12), pp.6605-6610
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.
關鍵字
語言英文
ISSN1095-3795;0163-1829
期刊性質國外
收錄於SCI
產學合作
通訊作者
審稿制度
國別美國
公開徵稿
出版型式紙本;電子版
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