Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s± Pairing

被引：20
|
作者：
Zhang, P. [1 ,2 ]
Richard, P. [1 ,2 ,3 ]
Qian, T. [1 ,2 ]
Shi, X. [1 ,2 ]
Ma, J. [1 ,2 ]
Zeng, L. -K. [1 ,2 ]
Wang, X. -P. [1 ,2 ]
Rienks, E. [4 ]
Zhang, C. -L. [5 ,6 ]
Dai, Pengcheng [1 ,2 ,5 ]
You, Y. -Z. [7 ]
Weng, Z. -Y. [3 ,7 ]
Wu, X. -X. [1 ,2 ]
Hu, J. P. [1 ,2 ,3 ,8 ]
Ding, H. [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China
[4] BESSY, Helmholtz Zentrum Berlin, D-12489 Berlin, Germany
[5] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA
[6] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[7] Tsinguha Univ, Inst Adv Study, Beijing 100084, Peoples R China
[8] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA
来源：
PHYSICAL REVIEW X | 2014年 / 4卷 / 03期
关键词：
NODELESS SUPERCONDUCTING GAPS;
D O I：
10.1103/PhysRevX.4.031001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the observation by angle-resolved photoemission spectroscopy of an impurity state located inside the superconducting gap of Ba0.6K0.4Fe2As2 and vanishing above the superconducting critical temperature, for which the spectral weight is confined in momentum space near the Fermi wave-vector positions. We demonstrate, supported by theoretical simulations, that this in-gap state originates from weak scattering between bands with opposite sign of the superconducting-gap phase. This weak scattering, likely due to off-plane nonmagnetic (Ba, K) disorder, occurs mostly among neighboring Fermi surfaces, suggesting that the superconducting-gap phase changes sign within holelike (and electronlike) bands. Our results impose severe restrictions on the models promoted to explain high-temperature superconductivity in these materials.
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页数：8
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