4F7-4F7 TRANSITIONS IN GD, OXIDIZED GD, AND EPITAXIAL GD SILICIDE

被引：22

作者：

MATTHEW, JAD ^{[1
]}

HENLE, WA ^{[1
]}

RAMSEY, MG ^{[1
]}

NETZER, FP ^{[1
]}

机构：

[1] UNIV INNSBRUCK,INST PHYS CHEM,A-6020 INNSBRUCK,AUSTRIA

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.43.4897

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

4f-4f transitions in the rare earths are investigated in a detailed study of the 4f7-4f7 excitations of Gd observed by electron-energy-loss spectroscopy in reflection mode. Consistent quasiatomic losses are observed in polycrystalline Gd metal, oxidized Gd, and an epitaxially ordered Gd silicide phase. Sharp 4f7-4f7 transitions, whose positions are independent of environment, are superposed on a broad loss background which changes markedly from system to system. Systematic variations in the intensity of multiplet components with electron primary energy and angle of scattering are presented, and attempts are made to distinguish contributions which arise from large-angle electron-exchange collisions without elastic scattering and those which involve both large-angle elastic scattering and inelastic exchange scattering. Theoretical estimates of spin-flip cross sections are consistent with the importance of high-momentum-transfer processes.

引用

页码：4897 / 4901

页数：5