Journal Article

PUBDB-2021-03007

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Subpicosecond metamagnetic phase transition in FeRh driven by non-equilibrium electron dynamics

Pressacco, F. (Corresponding author)XFEL.EU*DESY* ; Davide, S. ; Uhlir, V.Extern* ; Kutnyakhov, D.XFEL.EU*DESY* ; Arregi, J. A.Extern* ; Agustsson, S. Y.Extern* ; Brenner, G.DESY* ; Redlin, H.Extern* ; Heber, M.DESY* ; Vasilyev, D.Extern* ; Demsar, J.Extern* ; Schoenhense, G.Extern* ; Matteo, G. ; Andrea, M. ; Wurth, W.CFEL*Extern*XFEL.EU* ; Sirotti, F.Extern*

2021
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-021-25347-3  doi:10.3204/PUBDB-2021-03007

Abstract: Femtosecond light-induced phase transitions between different macroscopic orders provide the possibility to tune the functional properties of condensed matter on ultrafast timescales. In first-order phase transitions, transient non-equilibrium phases and inherent phase coexistence often preclude non-ambiguous detection of transition precursors and their temporal onset.Here, we present a study combining time-resolved photoelectron spectroscopy and ab-initio electron dynamics calculations elucidating the transient subpicosecond processes governing the photoinduced generation of ferromagnetic order in antiferromagnetic {F}e{R}h. The transient photoemission spectra are accounted for by assuming that not only the occupation of electronic states is modified during the photoexcitation process.Instead, the photo-generated non-thermal distribution of electrons modifies the electronic band structure. The ferromagnetic phase of FeRh, characterized by a minority band near the Fermi energy, is established $ 350 \pm 30$ fs after the laser excitation. Ab-initio calculations indicate that the phase transition is initiated by a photoinduced Rh-to-Fe charge transfer.

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Contributing Institute(s):

1. Laser Forschung und Entwicklung (FS-LA)
2. DOOR-User (DOOR ; HAS-User)
3. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
4. FS-FLASH (CFEL-UDSS)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G2 - FLASH (DESY) (POF4-6G2) (POF4-6G2)
3. DFG project 194651731 - EXC 1074: Hamburger Zentrum für ultraschnelle Beobachtung (CUI): Struktur, Dynamik und Kontrolle von Materie auf atomarer Skala (194651731) (194651731)
4. DFG project 170620586 - SFB 925: Licht-induzierte Dynamik und Kontrolle korrelierter Quantensysteme (170620586) (170620586)
5. MaX - MAterials design at the eXascale. European Centre of Excellence in materials modelling, simulations, and design (824143) (824143)
6. NFFA-Europe - NANOSCIENCE FOUNDRIES AND FINE ANALYSIS - EUROPE (654360) (654360)
7. DFG project 268565370 - TRR 173: Spin+X: Der Spin in seiner kollektiven Umgebung (268565370) (268565370)

Experiment(s):

1. FLASH Beamline PG2 (FLASH)

Appears in the scientific report 2021

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