Electronic structure and ultrafast dynamics of FeAs-based superconductors by angle- and time-resolved photoemission spectroscopy

被引：9

作者：

Avigo, I. ^{[1
]}

Thirupathaiah, S. ^{[2
]}

Rienks, E. D. L. ^{[3
,4
]}

Rettig, L. ^{[1
]}

Charnukha, A. ^{[5
]}

Ligges, M. ^{[1
]}

Cortes, R. ^{[6
]}

Nayak, J. ^{[7
]}

Jeevan, H. S. ^{[8
]}

Wolf, T. ^{[9
]}

Huang, Y. ^{[10
]}

Wurmehl, S. ^{[3
]}

Sturza, M. I. ^{[3
]}

Gegenwart, P. ^{[8
]}

Golden, M. S. ^{[10
]}

Yang, L. X. ^{[11
]}

Rossnagel, K. ^{[11
]}

Bauer, M. ^{[11
]}

Buechner, B. ^{[3
,4
]}

Vojta, M. ^{[4
]}

Wolf, M. ^{[6
]}

Felser, C. ^{[7
]}

Fink, J. ^{[3
,4
,7
]}

Bovensiepen, U. ^{[1
]}

机构：

[1] Univ Duisburg Essen, Fac Phys, Lotharstr 1, D-47057 Duisburg, Germany

[2] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

[3] Inst Solid State & Mat Res Dresden, Helmholtzstr 20, D-01069 Dresden, Germany

[4] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany

[5] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[6] Fritz Haber Inst MPG, Phys Chem Abt, Faradayweg 4-6, D-14195 Berlin, Germany

[7] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[8] Univ Augsburg, Inst Phys, Univ Str 1, D-86135 Augsburg, Germany

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

[10] Univ Amsterdam, Van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands

[11] Christian Albrechts Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2017年 / 254卷 / 01期

关键词：

angle-resolved photoemission spectroscopy; Electronic structure; iron-based superconductors; QUANTUM CRITICALITY; PENETRATION-DEPTH; TRANSPORT; CUPRATE; PHASE; RELAXATION; LIFETIMES; PARTICLE;

D O I：

10.1002/pssb.201600382

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this article, we review our angle- and time-resolved photoemission studies (ARPES and trARPES) on various ferropnictides. In the ARPES studies, we focus first on the band structure as a function of control parameters. We find near optimally doped compounds a Lifshitz transition of hole/electron pocket vanishing type. Second, we investigated the inelastic scattering rates as a function of the control parameter. In contrast to the heavily discussed quantum critical scenario, we find no enhancement of the scattering rate near optimally doping. Correlation effects which show up by the non-Fermi-liquid behavior of the scattering rates, together with the Lifshitz transition offer a new explanation for the strange normal state properties and suggests an interpolating superconducting state between BCS and BE condensation. Adding femtosecond time resolution to ARPES provides complementary information on electron and lattice dynamics. We report on the response of the chemical potential by a collective periodic variation coupled to coherent optical phonons in combination with incoherent electron and phonon dynamics described by a three temperature heat bath model. We quantify electron phonon coupling in terms of 2 and show that the analysis of the electron excess energy relaxation is a robust approach. The spin density wave ordering leads to a pronounced momentum dependent relaxation dynamics. In the vicinity of kF, hot electrons dissipate their energy by electron-phonon coupling with a characteristic time constant of 200fs. Electrons at the center of the hole pocket exhibit a four time slower relaxation which is explained by spin-dependent dynamics with its smaller relaxation phase space. This finding has implications beyond the material class of Fe-pnictides because it establishes experimental access to spin-dependent dynamics in materials with spin density waves. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页数：15

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