Electronic Structure of Eu6C60

被引：3

作者：

Wang Xiao-Xiong ^{[1
,2
]}

Li Hong-Nian ^{[1
]}

Xu Ya-Bo ^{[1
]}

Wang Peng ^{[1
]}

Zhang Wen-Hua ^{[3
]}

Xu Fa-Qiang ^{[3
]}

机构：

[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

[2] Nanjing Univ Sci & Technol, Coll Sci, Nanjing 210094, Peoples R China

[3] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2009年 / 26卷 / 01期

基金：

中国国家自然科学基金;

关键词：

DOPED C-60; MAGNETIC-PROPERTIES; FULLERIDES; PHOTOEMISSION; BAND; MONOLAYER; FULLERENE; AG(111); STATE;

D O I：

10.1088/0256-307X/26/1/017104

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the valence band of Eu-intercalated C-60 by synchrotron radiation photoelectron spectroscopy to understand the ferromagnetism ( FM) and the giant magnetoresistance ( GMR) of Eu6C60. The results reveal the semiconducting property and the remarkable 5d6s-pi hybridization. Eu-C-60 bonding has both ionic and covalent contributions. No more than half the 5d6s electrons transfer from Eu to the LUMO derived band of C-60, and the LUMO+1 derived band is not filled. The remaining valence electrons of Eu, together with some pi (LUMO, HOMO and HOMO-1) electrons, constitute the covalent bond. The electronic structure implies that the magnetic coupling in Eu6C60 should be through the intra-atomic f-sd exchange and the medium of the.. electrons. The possibility of the GMR being tunnelling magnetoresistance is ruled out.

引用

页数：4

共 22 条

[1] Crystal chemistry of europium fullerides [J].

Claves, D ;

Ksari-Habiles, Y ;

Chouteau, G ;

Touzain, P .

SOLID STATE COMMUNICATIONS, 1998, 106 (07) :431-435

[2] Angle-dependent oscillations in valence-band photoemission intensity of C60 [J].

He, S. ;

Arita, M. ;

Namatame, H. ;

Taniguchi, M. ;

Li, H-N ;

Li, H-Y .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2007, 19 (02)

[3] Synchrotron radiation photoemission study of yb-intercalated C60 -: art. no. 085404 [J].

He, SL ;

Li, HN ;

Wang, XX ;

Li, HY ;

Xu, YB ;

Bao, SN ;

Ibrahim, K ;

Qian, HJ ;

Su, R ;

Zhong, J ;

Hong, CH ;

Abbas, MI .

PHYSICAL REVIEW B, 2005, 71 (08)

[4] Charge transfer and doping-dependent hybridization of C60 on noble metals [J].

Hoogenboom, BW ;

Hesper, R ;

Tjeng, LH ;

Sawatzky, GA .

PHYSICAL REVIEW B, 1998, 57 (19) :11939-11942

[5] Ferromagnetism and giant magnetoresistance in the rare-earth fullerides Eu6-xSrxC60 -: art. no. 134431 [J].

Ishii, K ;

Fujiwara, A ;

Suematsu, H ;

Kubozono, Y .

PHYSICAL REVIEW B, 2002, 65 (13) :1-6

[6] ELECTRONIC STATES OF THE BA-C-60 COMPOUNDS [J].

KNUPFER, M ;

STEPNIAK, F ;

WEAVER, JH .

PHYSICAL REVIEW B, 1994, 49 (11) :7620-7624

[7] Superexchange and magnetic relaxation in novel Eu-doped C60 phases [J].

Ksari-Habiles, Y ;

Claves, D ;

Chouteau, G ;

Touzain, P ;

Jeandey, C ;

Oddou, JL ;

Stepanov, A .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1997, 58 (11) :1771-1778

[8] Magnetic ground state and Fermi surface of bcc Eu [J].

Kunes, J ;

Laskowski, R .

PHYSICAL REVIEW B, 2004, 70 (17) :1-6

[9] Electronic state of C60 monolayer on Ag(111) before and after Yb intercalation [J].

Li, HN ;

Wang, XX ;

He, SL ;

Ibrahim, K ;

Qian, HJ ;

Su, R ;

Zhong, J ;

Abbas, MI ;

Hong, CH .

SURFACE SCIENCE, 2005, 586 (1-3) :65-73

[10] Electron attenuation lengths in fullerene and fullerides [J].

Li, Hong-Nian ;

Wang, Xiao-Xiong ;

Ding, Wang-Feng .

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 2006, 153 (03) :96-101

← 1 2 3 →