Anomalous spin polarization and dualistic electronic nature of CrO2 -: art. no. 214419

被引：26

作者：

Huang, DJ ^{[1
]}

Tjeng, LH

Chen, J

Chang, CF

Wu, WP

Chung, SC

Tanaka, A

Guo, GY

Lin, HJ

Shyu, SG

Wu, CC

Chen, CT

机构：

[1] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

[2] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan

[3] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[4] Natl Chung Cheng Univ, Dept Phys, Chiayi 621, Taiwan

[5] Hiroshima Univ, ADSM, Dept Quantum Matters, Higashihiroshima 7398526, Japan

[6] Natl Taiwan Univ, Dept Phys, Taipei 106, Taiwan

[7] Acad Sinica, Inst Chem, Taipei 115, Taiwan

[8] Natl Cent Univ, Dept Chem, Tao Yuan 320, Taiwan

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.67.214419

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页数：5