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Journal Article

Photo-induced high-temperature ferromagnetism in YTiO3

MPS-Authors
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Disa,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
School of Applied and Engineering Physics, Cornell University;

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Fechner,  M.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Liu,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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von Hoegen,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Först,  M.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Nova,  T. F.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons133811

Cavalleri,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Clarendon Laboratory, Department of Physics, Oxford University;

External Resource

https://arxiv.org/abs/2111.13622
(Preprint)

https://doi.org/10.1038/s41586-023-05853-8
(Publisher version)

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Fulltext (public)

s41586-023-05853-8.pdf
(Publisher version), 13MB

Supplementary Material (public)

41586_2023_5853_MOESM1_ESM.pdf
(Supplementary material), 2MB

source.zip
(Supplementary material), 118KB

Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-000B-4198-0
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.