Electronic-structure modifications induced by surface segregation in La0.65Pb0.35MnO3 thin lms

被引:16
作者
Borca, CN
Xu, B
Komesu, T
Jeong, HK
Liu, MT
Liou, SH
Stadler, S
Idzerda, Y
Dowben, PA [1 ]
机构
[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA
[2] Univ Nebraska, Ctr Mat Res & Anal, Behlen Lab, Lincoln, NE 68588 USA
[3] USN, Res Lab, Mat Phys Branch, Washington, DC 20375 USA
来源
EUROPHYSICS LETTERS | 2001年 / 56卷 / 05期
关键词
D O I
10.1209/epl/i2001-00580-y
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Using spin-polarized inverse photoemission and X-ray absorption spectroscopy techniques, we show that the electronic structure of La0.65Pb0.35MnO3 thin lms depends on the composition at the surface. With a gentle annealing procedure, the surface provides a maximum of 80% spin asymmetry at 0.5 eV above the Fermi level in spite of extensive Pb segregation. A heavily annealed ( restructured) surface exhibits a reduced surface ordering temperature of 240 K ( compared to the approximately 335 K bulk value) as well as a reduced spin asymmetry value of 40% at 0.5 eV above Fermi energy.
引用
收藏
页码:722 / 728
页数:7
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