Abrupt change in the energy gap of superconducting Ba1-xKxFe2As2 single crystals with hole doping

被引：54

作者：

Malaeb, W. ^{[1
,2
]}

Shimojima, T. ^{[1
,3
]}

Ishida, Y. ^{[1
,3
]}

Okazaki, K. ^{[1
,3
]}

Ota, Y. ^{[1
]}

Ohgushi, K. ^{[1
,2
]}

Kihou, K. ^{[2
,4
]}

Saito, T. ^{[5
]}

Lee, C. H. ^{[2
,4
]}

Ishida, S. ^{[4
,6
]}

Nakajima, M. ^{[4
,6
]}

Uchida, S. ^{[6
]}

Fukazawa, H. ^{[2
,5
]}

Kohori, Y. ^{[2
,5
]}

Iyo, A. ^{[2
,4
]}

Eisaki, H. ^{[2
,4
]}

Chen, C. -T. ^{[7
]}

Watanabe, S. ^{[1
]}

Ikeda, H. ^{[8
]}

Shin, S. ^{[1
,2
,3
]}

机构：

[1] Univ Tokyo, ISSP, Kashiwa, Chiba 2778581, Japan

[2] Japan Sci & Technol Agcy JST, Transformat Res Project Iron Pnictides TRIP, Tokyo 1020075, Japan

[3] Japan Sci & Technol Agcy JST, CREST, Tokyo 1020075, Japan

[4] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[5] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[6] Univ Tokyo, Dept Phys, Tokyo 1138656, Japan

[7] Chinese Acad Sci, Beijing Ctr Crystal Res & Dev, Beijing 100190, Peoples R China

[8] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 16期

基金：

日本学术振兴会;

关键词：

LOCALIZED WANNIER FUNCTIONS; IRON PNICTIDES; BA0.6K0.4FE2AS2;

D O I：

10.1103/PhysRevB.86.165117

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1-xKxFe2As2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for x greater than or similar to 0.6) while the inner and middle FS gaps roughly scale with T-c. This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of X-2-Y-2 and XZ/YZ orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors.

引用

页数：7

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