Data availability
The data that support the findings of this study are available from the
corresponding author upon request. Source data are provided with
this paper.
Acknowledgements We acknowledge the European Synchrotron Radiation Facility for
provision of synchrotron beamtime at beamline ID27, the Agence Nationale de la Recherche
for financial support under grant number ANR 13-BS04-0015 (MOFLEX) and Almax easy Lab for
providing the diamond cylinders.
Author contributions The original idea was conceived by M.M. The experiments were
performed by L.H., G.G., D.S. and M.M. with equal contributions. The data were analysed and
the figures produced by L.H. with contributions from all the co-authors. The manuscript was
written by M.M. and F.D. with contributions from all the co-authors.Competing interests The authors declare no competing interests.
Additional information
Supplementary information is available for this paper at https://doi.org/10.1038/s41586-020-
2593-1.
Correspondence and requests for materials should be addressed to M.M.
Peer review information Nature thanks Yoshio Kono, Wenge Yang and the other, anonymous,
reviewer(s) for their contribution to the peer review of this work.
Reprints and permissions information is available at http://www.nature.com/reprints.