Direct observation of spin-orbit coupling in iron-based superconductors

被引：175

作者：

Borisenko, S. V. ^{[1
]}

Evtushinsky, D. V. ^{[1
]}

Liu, Z-H. ^{[1
]}

Morozov, I. ^{[1
,2
]}

Kappenberger, R. ^{[1
]}

Wurmehl, S. ^{[1
,3
]}

Buechner, B. ^{[1
,3
]}

Yaresko, A. N. ^{[4
]}

Kim, T. K. ^{[5
]}

Hoesch, M. ^{[5
]}

Wolf, T. ^{[6
]}

Zhigadlo, N. D. ^{[7
]}

机构：

[1] IFW Dresden, Helmholtzstr 20, D-01069 Dresden, Germany

[2] Moscow MV Lomonosov State Univ, GSP 1, Moscow 119991, Russia

[3] Tech Univ Dresden, Inst Solid State Phys, D-01062 Dresden, Germany

[4] Max Planck Inst Solid State Res, Heisenbergstr 1, D-70569 Stuttgart, Germany

[5] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[6] Karlsruhe Inst Technol, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[7] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

NATURE PHYSICS | 2016年 / 12卷 / 04期

关键词：

Electrons - Photoelectron spectroscopy - Iron-based Superconductors - Fermi surface - Topology - Spin fluctuations;

D O I：

10.1038/NPHYS3594

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spin-orbit coupling is a fundamental interaction in solids that can induce a broad range of unusual physical properties, from topologically non-trivial insulating states to unconventional pairing in superconductors(1-7). In iron-based superconductors its role has, so far, not been considered of primary importance, with models based on spin-or orbital fluctuations pairing being used most widely(8-10). Using angle-resolved photoemission spectroscopy, we directly observe a sizeable spin-orbit splitting in all the main members of the iron-based superconductors. We demonstrate that its impact on the low-energy electronic structure and details of the Fermi surface topology is stronger than that of possible nematic ordering(11-13). The largest pairing gap is supported exactly by spin-orbit-coupling-induced Fermi surfaces, implying a direct relation between this interaction and the mechanism of high-temperature superconductivity.

引用

页码：311 / U145

页数：8

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