Fanfarillo, Laura ORCID: 0000-0002-6452-8520, Kopic, Damir, Sterzi, Andrea, Manzoni, Giulia, Crepaldi, Alberto ORCID: 0000-0001-9971-1731, Payne, Daniel T., Bronsch, Wibke ORCID: 0000-0002-6012-9290, Tsurkan, Vladimir, Croitori, Dorina, Deisenhofer, Joachim, Parmigiani, Fulvio, Capone, Massimo ORCID: 0000-0002-9811-5089 and Cilento, Federico (2021). Photoinduced long-lived state in FeSe0.4Te0.6. J. Electron Spectrosc. Relat. Phenom., 250. AMSTERDAM: ELSEVIER. ISSN 1873-2526

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Abstract

Fe(Sex)Te(1-)x compounds display a rich phase diagram, ranging from the nematicity of FeSe to the (pi, pi) magnetism of FeTe. We focus on FeSe0.4Te0.6, and exploit tr-ARPES to study its ultrafast electron dynamics following photoexcitation by near-infrared pump pulses. By exploiting probe-polarization-dependent matrix element effects, we reveal a photoinduced long-lived state, lasting for a few tens of picoseconds, showing features compatible with a nematic state. The possibility to induce a long-lived state in this compound by using ultra-short pulses might shed a new light on the driving force behind the nematic symmetry breaking in iron-based superconductors. With the aid of a phenomenological model, we illustrate how our results possibly question the common belief that a low-energy coupling with fluctuations is a necessary condition to stabilize the nematic order. On the contrary, the tendency towards orbital differentiation due to strong electronic correlations induced by the Hund's coupling could be at the origin of the nematic order in iron-based superconductors.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Fanfarillo, LauraUNSPECIFIEDorcid.org/0000-0002-6452-8520UNSPECIFIED
Kopic, DamirUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sterzi, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Manzoni, GiuliaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Crepaldi, AlbertoUNSPECIFIEDorcid.org/0000-0001-9971-1731UNSPECIFIED
Payne, Daniel T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bronsch, WibkeUNSPECIFIEDorcid.org/0000-0002-6012-9290UNSPECIFIED
Tsurkan, VladimirUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Croitori, DorinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deisenhofer, JoachimUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parmigiani, FulvioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Capone, MassimoUNSPECIFIEDorcid.org/0000-0002-9811-5089UNSPECIFIED
Cilento, FedericoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-600318
DOI: 10.1016/j.elspec.2021.147090
Journal or Publication Title: J. Electron Spectrosc. Relat. Phenom.
Volume: 250
Date: 2021
Publisher: ELSEVIER
Place of Publication: AMSTERDAM
ISSN: 1873-2526
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SUPERCONDUCTIVITYMultiple languages
SpectroscopyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/60031

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