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

Avigo, I., Thirupathaiah, S., Rienks, E. D. L., Rettig, L., Charnukha, A., Ligges, M., et al. (2017). Electronic structure and ultrafast dynamics of FeAs-based superconductors by angle- and time-resolved photoemission spectroscopy. Physica Status Solidi B, 254(1): 1600382, pp. 1-15. doi:10.1002/pssb.201600382.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-A94D-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-1982-7
Genre: Journal Article

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Avigo, I.1, Author
Thirupathaiah, S.1, Author
Rienks, E. D. L.1, Author
Rettig, L.1, Author
Charnukha, A.1, Author
Ligges, M.1, Author
Cortes, R.1, Author
Nayak, J.2, Author              
Jeevan, H. S.1, Author
Wolf, T.1, Author
Huang, Y.1, Author
Wurmehl, S.1, Author
Sturza, M. I.1, Author
Gegenwart, P.1, Author
Golden, M. S.1, Author
Yang, L. X.1, Author
Rossnagel, K.1, Author
Bauer, M.1, Author
Büchner, B.1, Author
Vojta, M.1, Author
Wolf, M.1, AuthorFelser, C.3, Author              Fink, J.2, Author              Bovensiepen, U.1, Author more..
Affiliations:
1External Organizations, escidoc:persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863429              

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 Abstract: 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

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Language(s): eng - English
 Dates: 2017-01-252017-01-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1002/pssb.201600382
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Title: Physica Status Solidi B
  Abbreviation : Phys. Stat. Sol. B
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 254 (1) Sequence Number: 1600382 Start / End Page: 1 - 15 Identifier: ISSN: 0370-1972
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/958480240330