ELECTRONIC STRUCTURAL-CHANGES IN Y1-XPRXBA2CU3O7-DELTA SINGLE-CRYSTALS DUE TO PR4F STATES

被引:5
作者
HARTMANN, A [1 ]
RUSSELL, GJ [1 ]
FRENTRUP, W [1 ]
TAYLOR, KNR [1 ]
机构
[1] HUMBOLDT UNIV BERLIN,O-1040 BERLIN,GERMANY
关键词
D O I
10.1016/0038-1098(94)90422-7
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Electronic structural changes in both tetragonal and orthorhombic Y1-xPrxBa2Cu3O7-delta (x = 0, 0.5, 1) single crystals due to Pr4f states have been studied using the techniques of EELS and NEXAFS. The EELS data from cleaved surfaces for the energy range 4-37 eV show no extra peaks due to Pr4f states, while the positions of the Y4d and Pr5d bands above E(F) appear to be identical indicating a very similar DOS structure above E(F). The Ols-NEXAFS data shows empty p-states above E(F) aom unfilled Pr4f states hybridized with O2p states. The large relative intensity of the 02p-Pr4f hybrid-state peaks at similar to 3 eV, 5.5-6.0 eV for the tetragonal crystals and at similar to 4 eV, 6.3 eV for the orthorhombic crystals indicates very strong hybridization as the relative density of the empty Pr4f states is small. Intensity changes associated with a peak at 1.3 eV above E(F) found for the tetragonal crystals, could indicate changes in O2p-Cu3d((x2-y2),(3z2=r2)) hybridization with different Pr content.
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收藏
页码:77 / 80
页数:4
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