Identifying the 'fingerprint' of antiferromagnetic spin fluctuations in iron pnictide superconductors

被引：36

作者：

Allan, M. P. ^{[1
,2
]}

Lee, Kyungmin ^{[1
]}

Rost, A. W. ^{[1
,3
,4
]}

Fischer, M. H. ^{[1
]}

Massee, F. ^{[1
,2
]}

Kihou, K. ^{[5
,6
]}

Lee, C-H. ^{[5
,6
]}

Iyo, A. ^{[5
,6
]}

Eisaki, H. ^{[5
,6
]}

Chuang, T-M. ^{[7
]}

Davis, J. C. ^{[1
,2
,3
,8
]}

Kim, Eun-Ah ^{[1
]}

机构：

[1] Cornell Univ, Dept Phys, LASSP, Ithaca, NY 14853 USA

[2] Brookhaven Natl Lab, CMPMS Dept, Upton, NY 11973 USA

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

[4] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

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

[6] JST, Transformat Res Project Iron Pnictides TRIP, Tokyo 1020075, Japan

[7] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[8] Cornell Univ, Kavli Inst Cornell Nanoscale Sci, Ithaca, NY 14853 USA

来源：

NATURE PHYSICS | 2015年 / 11卷 / 02期

基金：

英国工程与自然科学研究理事会; 日本学术振兴会;

关键词：

Binary alloys - Spin fluctuations - Iron-based Superconductors - Antiferromagnetism - Iron alloys - Electrons - Iron compounds;

D O I：

10.1038/NPHYS3187

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Cooper pairing in the iron-based high-T-c superconductors(1-3) is often conjectured to involve bosonic fluctuations. Among the candidates are antiferromagnetic spin fluctuations(1,4,5) and d-orbital fluctuations amplified by phonons(6,7). Any such electron-boson interaction should alter the electron's 'self-energy', and then become detectable through consequent modifications in the energy dependence of the electron's momentum and lifetime(8-10). Here we introduce a novel theoretical/experimental approach aimed at uniquely identifying the relevant fluctuations of iron-based superconductors by measuring effects of their self-energy. We use innovative quasiparticle interference (QPI) imaging(11) techniques in LiFeAs to reveal strongly momentum-space anisotropic self-energy signatures that are focused along the Fe-Fe (interband scattering) direction, where the spin fluctuations of LiFeAs are concentrated. These effects coincide in energy with perturbations to the density of states N(omega) usually associated with the Cooper pairing interaction. We show that all the measured phenomena comprise the predicted QPI 'fingerprint' of a self-energy due to antiferromagnetic spin fluctuations, thereby distinguishing them as the predominant electron-boson interaction.

引用

页码：177 / 182

页数：6

共 33 条

[1] Anisotropic Energy Gaps of Iron-Based Superconductivity from Intraband Quasiparticle Interference in LiFeAs [J].

Allan, M. P. ;

Rost, A. W. ;

Mackenzie, A. P. ;

Xie, Yang ;

Davis, J. C. ;

Kihou, K. ;

Lee, C. H. ;

Iyo, A. ;

Eisaki, H. ;

Chuang, T. -M. .

SCIENCE, 2012, 336 (6081) :563-567

[2] One-Sign Order Parameter in Iron Based Superconductor [J].

Borisenko, Sergey V. ;

Zabolotnyy, Volodymyr B. ;

Kordyuk, Alexnader A. ;

Evtushinsky, Danil V. ;

Kim, Timur K. ;

Morozov, Igor V. ;

Follath, Rolf ;

Buechner, Bernd .

SYMMETRY-BASEL, 2012, 4 (01) :251-264

[3] Visualizing the microscopic coexistence of spin density wave and superconductivity in underdoped NaFe1-xCoxAs [J].

Cai, Peng ;

Zhou, Xiaodong ;

Ruan, Wei ;

Wang, Aifeng ;

Chen, Xianhui ;

Lee, Dung-Hai ;

Wang, Yayu .

NATURE COMMUNICATIONS, 2013, 4

[4] Scanning Tunneling Spectroscopy of Superconducting LiFeAs Single Crystals: Evidence for Two Nodeless Energy Gaps and Coupling to a Bosonic Mode [J].

Chi, Shun ;

Grothe, S. ;

Liang, Ruixing ;

Dosanjh, P. ;

Hardy, W. N. ;

Burke, S. A. ;

Bonn, D. A. ;

Pennec, Y. .

PHYSICAL REVIEW LETTERS, 2012, 109 (08)

[5] Self-energy effects and electron-phonon coupling in Fe-As superconductors [J].

Choi, K-Y ;

Lemmens, P. ;

Eremin, I. ;

Zwicknagl, G. ;

Berger, H. ;

Sun, G. L. ;

Sun, D. L. ;

Lin, C. T. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2010, 22 (11)

[6] Quasi-particle interference probe of the self-energy [J].

Dahm, Thomas ;

Scalapino, D. J. .

NEW JOURNAL OF PHYSICS, 2014, 16

[7] Tight-binding models for the iron-based superconductors [J].

Eschrig, Helmut ;

Koepernik, Klaus .

PHYSICAL REVIEW B, 2009, 80 (10)

[8] Local Quasiparticle Density of States of Superconducting SmFeAsO1-xFx Single Crystals: Evidence for Spin-Mediated Pairing [J].

Fasano, Y. ;

Maggio-Aprile, I. ;

Zhigadlo, N. D. ;

Katrych, S. ;

Karpinski, J. ;

Fischer, O. .

PHYSICAL REVIEW LETTERS, 2010, 105 (16)

[9] Three-dimensional electronic structure and interband nesting in the stoichiometric superconductor LiFeAs [J].

Hajiri, T. ;

Ito, T. ;

Niwa, R. ;

Matsunami, M. ;

Min, B. H. ;

Kwon, Y. S. ;

Kimura, S. .

PHYSICAL REVIEW B, 2012, 85 (09)

[10] Effect of spin fluctuations on the electronic structure in iron-based superconductors [J].

Heimes, Andreas ;

Grein, Roland ;

Eschrig, Matthias .

PHYSICAL REVIEW B, 2012, 86 (06)

← 1 2 3 4 →