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  Evidence for metastable photo-induced superconductivity in K3C60

Budden, M., Gebert, T., Buzzi, M., Jotzu, G., Wang, E., Matsuyama, T., et al. (2021). Evidence for metastable photo-induced superconductivity in K3C60. Nature Physics, 17(5), 611-618. doi:10.1038/s41567-020-01148-1.

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 Creators:
Budden, M.1, Author           
Gebert, T.1, Author           
Buzzi, M.1, Author           
Jotzu, G.1, Author           
Wang, E.1, Author           
Matsuyama, T.2, Author           
Meier, G.2, Author           
Laplace, Y.1, Author           
Pontiroli, D.3, Author
Riccò, M.3, Author
Schlawin, F.4, Author
Jaksch, D.4, Author
Cavalleri, A.1, 4, 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              
2Ultrafast Electronics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074323              
3Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università degli Studi di Parma, ou_persistent22              
4Department of Physics, Clarendon Laboratory, University of Oxford, ou_persistent22              

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 Abstract: Excitation of high-Tc cuprates and certain organic superconductors with intense far-infrared optical pulses has been shown to create non-equilibrium states with optical properties that are consistent with transient high-temperature superconductivity. These non-equilibrium phases have been generated using femtosecond drives, and have been observed to disappear immediately after excitation, which is evidence of states that lack intrinsic rigidity. Here we make use of a new optical device to drive metallic K3C60 with mid-infrared pulses of tunable duration, ranging between one picosecond and one nanosecond. The same superconducting-like optical properties observed over short time windows for femtosecond excitation are shown here to become metastable under sustained optical driving, with lifetimes in excess of ten nanoseconds. Direct electrical probing, which becomes possible at these timescales, yields a vanishingly small resistance with the same relaxation time as that estimated by terahertz conductivity. We provide a theoretical description of the dynamics after excitation, and justify the observed slow relaxation by considering randomization of the order-parameter phase as the rate-limiting process that determines the decay of the light-induced superconductor.

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Language(s): eng - English
 Dates: 2020-06-272020-12-112021-02-042021-05
 Publication Status: Issued
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2002.12835
DOI: 10.1038/s41567-020-01148-1
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Grant ID : 319286
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)
Project name : The research leading to these results received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. 319286 (QMAC). We acknowledge support from the Deutsche Forschungsgemeinschaft via the Cluster of Excellence ‘The Hamburg Centre for Ultrafast Imaging’ (EXC 1074 – project ID 194651731). E.W. was supported by a fellowship from the Alexander von Humboldt Foundation. We thank M. Volkmann for his technical assistance in the construction of the new optical apparatus presented in this work. We are also grateful to E. König, B. Fiedler and B. Höhling for their support in the fabrication of the electronic transport samples, and to J. Harms for assistance with graphics. Open access funding was provided by the Max Planck Society.
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: 17 (5) Sequence Number: - Start / End Page: 611 - 618 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850