標題: Anomalous spin polarization and dualistic electronic nature of CrO2
作者: Huang, DJ
Tjeng, LH
Chen, J
Chang, CF
Wu, WP
Chung, SC
Tanaka, A
Guo, GY
Lin, HJ
Shyu, SG
Wu, CC
Chen, CT
電子物理學系
Department of Electrophysics
公開日期: 1-Jun-2003
摘要: Spin-resolved O 1s x-ray absorption measurements on CrO2 reveal that the spin polarization of the states at the Fermi level approaches 100%, providing direct evidence of the half-metallic nature of CrO2. The measurements also show the existence of an atomiclike Cr 3d state not far away from the Fermi level with a spin polarization of only 50%, establishing its Mott-Hubbard character. We conclude that CrO2 has a dualistic electronic nature, in which the states at the Fermi level are bandlike, while those at higher energies are strongly localized of completely different origin and symmetry. The finding of an exceptionally large number of O 2p holes suggests their important role in preventing the strongly correlated CrO2 from being an insulator.
URI: http://dx.doi.org/10.1103/PhysRevB.67.214419
http://hdl.handle.net/11536/148568
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.67.214419
期刊: PHYSICAL REVIEW B
Volume: 67
Issue: 21
起始頁: 0
結束頁: 0
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