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  Photo-induced high-temperature ferromagnetism in YTiO3

Disa, A., Curtis, J., Fechner, M., Liu, A., von Hoegen, A., Först, M., et al. (2023). Photo-induced high-temperature ferromagnetism in YTiO3. Nature, 617(7959), 73-78. doi:10.1038/s41586-023-05853-8.

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Supplementary Information: Additional discussion of DFT calculations (Supplementary Section 1) including Supplementary Figs. 1 and 2, details regarding magnetization dynamics (Supplementary Section 2) including Figs. 3–7, and additional references.
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 Creators:
Disa, A.1, 2, Author           
Curtis, J.3, 4, Author
Fechner, M.1, Author           
Liu, A.1, Author           
von Hoegen, A.1, Author           
Först, M.1, Author           
Nova, T. F.1, Author           
Narang, P.3, 4, Author
Maljuk, A.5, Author
Boris, A. V.6, Author
Keimer, B.6, Author
Cavalleri, A.1, 7, Author           
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2School of Applied and Engineering Physics, Cornell University, ou_persistent22              
3John A. Paulson School of Engineering and Applied Sciences, Harvard University, ou_persistent22              
4College of Letters and Science, University of California, ou_persistent22              
5Leibniz Institute for Solid State and Materials Research, ou_persistent22              
6Max Planck Institute for Solid State Research, ou_persistent22              
7Clarendon Laboratory, Department of Physics, Oxford University, ou_persistent22              

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 Abstract: In quantum materials, degeneracies and frustrated interactions can have a profound impact on the emergence of long-range order, often driving strong fluctuations that suppress functionally relevant electronic or magnetic phases1,2,3,4,5,6,7. Engineering the atomic structure in the bulk or at heterointerfaces has been an important research strategy to lift these degeneracies, but these equilibrium methods are limited by thermodynamic, elastic and chemical constraints8. Here we show that all-optical, mode-selective manipulation of the crystal lattice can be used to enhance and stabilize high-temperature ferromagnetism in YTiO3, a material that shows only partial orbital polarization, an unsaturated low-temperature magnetic moment and a suppressed Curie temperature, T3 = 27 K (refs. 9,10,11,12,13). The enhancement is largest when exciting a 9 THz oxygen rotation mode, for which complete magnetic saturation is achieved at low temperatures and transient ferromagnetism is realized up to Tneq > 80 K, nearly three times the thermodynamic transition temperature. We interpret these effects as a consequence of the light-induced dynamical changes to the quasi-degenerate Ti t2g orbitals, which affect the magnetic phase competition and fluctuations found in the equilibrium state14,15,16,17,18,19,20. Notably, the light-induced high-temperature ferromagnetism discovered in our work is metastable over many nanoseconds, underscoring the ability to dynamically engineer practically useful non-equilibrium functionalities.

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Language(s): eng - English
 Dates: 2021-11-132023-02-162023-05-032023-05-04
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2111.13622
DOI: 10.1038/s41586-023-05853-8
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Project name : We thank A. Millis, Z. Sun and G. Khaliullin for insightful discussions. We also gratefully acknowledge K. S. Rabinovich for the X-ray diffraction and magnetization measurements. This work was supported by the Deutsche Forschungsgemeinschaft Cluster of Excellence ‘CUI: Advanced Imaging of Matter’ (EXC 2056 with project ID no. 390715994). A.S.D. and A.L. were supported by fellowships from the Alexander von Humboldt foundation. A.S.D. and A.C. also acknowledge support from the Max Planck – New York City Center for Non-equilibrium Quantum Phenomena. P.N. gratefully acknowledges support from the Gordon and Betty Moore Foundation through a Moore Inventor Fellowship (grant no. GBMF8048) and from the Max Planck Society through a Max Planck Sabbatical Award.
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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 617 (7959) Sequence Number: - Start / End Page: 73 - 78 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238