Common Fermi-surface topology and nodeless superconducting gap of K0.68Fe1.79Se2 and (Tl0.45K0.34)Fe1.84Se2 superconductors revealed via angle-resolved photoemission

被引：80

作者：

Zhao, Lin ^{[1
]}

Mou, Daixiang ^{[1
]}

Liu, Shanyu ^{[1
]}

Jia, Xiaowen ^{[1
]}

He, Junfeng ^{[1
]}

Peng, Yingying ^{[1
]}

Yu, Li ^{[1
]}

Liu, Xu ^{[1
]}

Liu, Guodong ^{[1
]}

He, Shaolong ^{[1
]}

Dong, Xiaoli ^{[1
]}

Zhang, Jun ^{[1
]}

He, J. B. ^{[2
]}

Wang, D. M. ^{[2
]}

Chen, G. F. ^{[2
]}

Guo, J. G. ^{[1
]}

Chen, X. L. ^{[1
]}

Wang, Xiaoyang ^{[3
]}

Peng, Qinjun ^{[3
]}

Wang, Zhimin ^{[3
]}

Zhang, Shenjin ^{[3
]}

Yang, Feng ^{[3
]}

Xu, Zuyan ^{[3
]}

Chen, Chuangtian ^{[3
]}

Zhou, X. J. ^{[1
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

[2] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China

[3] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.83.140508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We carried out high-resolution angle-resolved photoemission measurements on the electronic structure and superconducting gap of K0.68Fe1.79Se2 (T-c = 32 K) and (Tl0.45K0.34)Fe1.84Se2 (T-c = 28 K) superconductors. In addition to the electron-like Fermi surface near M(pi, pi), two electron-like Fermi pockets are revealed around the zone center Gamma (0,0) in K0.68Fe1.79Se2. This observation makes the Fermi surface topology of K0.68Fe1.79Se2 consistent with that of (Tl, Rb)(x)Fe2-ySe2 and (Tl, K)(x)Fe2-ySe2 compounds. A nearly isotropic superconducting gap Delta is observed along the electron-like Fermi pocket near the M point in K0.68Fe1.79Se2 (Delta similar to 9 meV) and (Tl0.45K0.34)Fe1.84Se2 (Delta similar to 8 meV). The establishment of a universal picture on the Fermi surface topology and superconducting gap in the A(x)Fe(2-y)Se(2) (A = K, Tl, Cs, Rb, etc.) superconductors will provide important information for understanding the superconductivity mechanism of iron-based superconductors.

引用

页数：4

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