Impact of iron-site defects on superconductivity in LiFeAs

被引：23

作者：

Chi, Shun ^{[1
,2
]}

Aluru, Ramakrishna ^{[3
,4
]}

Singh, Udai Raj ^{[3
]}

Liang, Ruixing ^{[1
,2
]}

Hardy, Walter N. ^{[1
,2
]}

Bonn, D. A. ^{[1
,2
]}

Kreisel, A. ^{[5
]}

Andersen, Brian M. ^{[5
]}

Nelson, R. ^{[6
]}

Berlijn, T. ^{[7
,8
]}

Ku, W. ^{[9
,10
]}

Hirschfeld, P. J. ^{[11
]}

Wahl, Peter ^{[3
,4
]}

机构：

[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[2] Univ British Columbia, Quantum Matter Inst, Vancouver, BC V6T 1Z4, Canada

[3] Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany

[4] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

[5] Univ Copenhagen, Niels Bohr Inst, Univ Pk 5, DK-2100 Copenhagen, Denmark

[6] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[7] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[8] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA

[9] Brookhaven Natl Lab, CMPMSD, Upton, NY 11973 USA

[10] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

[11] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 13期

基金：

英国工程与自然科学研究理事会; 中国国家自然科学基金;

关键词：

SYMMETRY;

D O I：

10.1103/PhysRevB.94.134515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In conventional s-wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s(+/-) order parameter they can occur for both magnetic and nonmagnetic impurities. Impurity bound states in superconductors can thus provide important insight into the order parameter. Here, we present a combined experimental and theoretical study of native and engineered iron-site defects in LiFeAs. A detailed comparison of tunneling spectra measured on impurities with spin-fluctuation theory reveals a continuous evolution from negligible impurity-bound-state features for weaker scattering potential to clearly detectable states for somewhat stronger scattering potentials. All bound states for these intermediate strength potentials are pinned at or close to the gap edge of the smaller gap, a phenomenon that we explain and ascribe to multiorbital physics.

引用

页数：6

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