Electronic band structure of AlB2 studied by angle-resolved photoemission spectroscopy

被引：5
作者：
Souma, S [1 ]
Sato, T
Takahashi, T
Kimura, N
Aoki, H
机构：
[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
[2] Tohoku Univ, Ctr Low Temp Sci, Sendai, Miyagi 9808578, Japan
来源：
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2005年 / 144卷
关键词：
superconductivity; MgB2; AlB2; ARPES;
D O I：
10.1016/j.elspec.2005.01.126
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
We have performed UV and X-ray angle-resolved photoemission spectroscopy (ARPES) on AlB2 which is a non-superconducting reference of MgB2. We found that the or-band is totally occupied in AlB2 in contrast to the partially occupied a-band in MgB2, which suggests that the sigma-band on the Fermi level is essential for the superconductivity. We also found an electron pocket centered at the Gamma(A) point in the UVARPES spectrum as in MgB2, while it is absent in the X-ray ARPES spectra. This indicates that the electron pocket is of surface origin. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：545 / 547
页数：3
相关论文
共 18 条
[1]   Superconductivity of MgB2: Covalent bonds driven metallic [J].
An, J.M., 2001, American Institute of Physics Inc. (86)
[2]  
ANTROPOV VP, 2001, STUDIES HIGH TEMPERA, V35
[3]   Boron isotope effect in superconducting MgB2 [J].
Bud'ko, SL ;
Lapertot, G ;
Petrovic, C ;
Cunningham, CE ;
Anderson, N ;
Canfield, PC .
PHYSICAL REVIEW LETTERS, 2001, 86 (09) :1877-1880
[4]   Review of the superconducting properties of MgB2 [J].
Buzea, C ;
Yamashita, T .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2001, 14 (11) :R115-R146
[5]   The origin of the anomalous superconducting properties of MgB2 [J].
Choi, HJ ;
Roundy, D ;
Sun, H ;
Cohen, ML ;
Louie, SG .
NATURE, 2002, 418 (6899) :758-760
[6]   Electron-phonon interaction in the normal and superconducting states of MgB2 -: art. no. 020501 [J].
Kong, Y ;
Dolgov, OV ;
Jepsen, O ;
Andersen, OK .
PHYSICAL REVIEW B, 2001, 64 (02)
[7]  
Kortus J, 2001, PHYS REV LETT, V86, P4656, DOI 10.1103/PhysRevLett.86.4656
[8]   Beyond Eliashberg superconductivity in MgB2:: Anharmonicity, two-phonon scattering, and multiple gaps -: art. no. 087005 [J].
Liu, AY ;
Mazin, II ;
Kortus, J .
PHYSICAL REVIEW LETTERS, 2001, 87 (08) :87005-1
[9]   Superconductivity at 39 K in magnesium diboride [J].
Nagamatsu, J ;
Nakagawa, N ;
Muranaka, T ;
Zenitani, Y ;
Akimitsu, J .
NATURE, 2001, 410 (6824) :63-64
[10]   Electronic structure of B-2p state in AIB2 single crystal:: Direct observation of pσ and pπ density of states [J].
Nakamura, J ;
Watanabe, M ;
Oguchi, T ;
Nasubida, SY ;
Kabasawa, E ;
Yamada, N ;
Kuroki, K ;
Yamazaki, H ;
Shin, S ;
Umeda, Y ;
Minakawa, S ;
Kimura, N ;
Aoki, H .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2002, 71 (02) :408-410
12