Observation of metal–insulator transition in Al–Pd–Re quasicrystals by x-ray absorption and photoemission spectroscopy
學年 91
學期 2
出版（發表）日期 2003-03-31
作品名稱 Observation of metal–insulator transition in Al–Pd–Re quasicrystals by x-ray absorption and photoemission spectroscopy
作品名稱（其他語言）
著者 Lay, Y. Y.; Jan, J. C.; Chiou, J. W.; Tsai, H. M.; Pong, W. F.; Tsai, M. H.; Pi, T. W.; Lee, J. F.; Ma, C. I.; Tseng, K. L.; Wang, C. R.; Lin, S. T.
單位 淡江大學物理學系
出版者 College Park: American Institute of Physics (AIP)
著錄名稱、卷期、頁數 Applied Physics Letters 82(13), pp.2035-2037
摘要 Using x-ray absorption and valence-band photoelectron spectroscopy (PES) we investigated the electronic structures of icosahedral (i)-Al70Pd22.5Re7.5 quasicrystals (QCs) with a 4.2 K/300 K resistivity ratio, r, ranging from 8.3 to 107 obtained under various annealing conditions. Our Al K- and Pd L3-edge x-ray absorption results show that the density of states, N(E), near the Fermi level, EF, jumps to a larger value when r decreases down to below about 20.6. The valence-band PES results show that N(E) near EF is greatly reduced in i-Al70Pd22.5Re7.5 QCs relative to that of the pure metal, which confirms the existence of the pseudogap. The PES spectrum has a sharp cutoff at EF for r=8.3 QC, while it decreases smoothly down to zero at EF for larger r’s. The combined results suggest the occurrence of metal–insulator transition at an r between 13 and 20.6.
關鍵字
語言 en
ISSN 0003-6951
期刊性質 國外
收錄於
產學合作
通訊作者
審稿制度
國別 USA
公開徵稿
出版型式 紙本
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