Author Affiliations

H. Fukuzawa,^1,2,* K. Motomura,¹ T. Tachibana,¹ Z. Jurek,³ S.-K. Son,³ P. Johnsson,⁴ K. Nagaya,^2,5 M. Siano,⁶ S. Wada,^2,7 S. Mondal,¹ M. Kimura,¹ Y. Ito,¹ T. Sakai,⁵ K. Matsunami,⁵ H. Hayashita,⁷ J. Kajikawa,⁷ X.-J. Liu,⁸ E. Robert,⁸ C. Miron,⁸ R. Feifel,⁹ E. Kukk,¹⁰ B. Rudek,^11,12 B. Erk,^11,12 L. Foucar,^11,13 J. Marangos,⁶ K. Tono,¹⁴ Y. Inubushi,² T. Hatsui,² M. Yabashi,² B. Ziaja,^3,15 R. Santra,^3,16 M. Yao,⁵ and K. Ueda^1,2

¹Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

²RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan

³Center for Free-Electron Laser Science (CFEL), DESY, 22607 Hamburg, Germany

⁴Department of Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden

⁵Department of Physics, Kyoto University, Kyoto 606-8502, Japan

⁶Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom

⁷Department of Physical Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan

⁸Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, FR-91192 Gif-sur-Yvette Cedex, France

⁹Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden

¹⁰Department of Physics and Astronomy, University of Turku, 20014, Finland

¹¹Max-Planck Advanced Study Group at CFEL, 22607 Hamburg, Germany

¹²Max-Planck-Insitut für Kernphysik, 69117 Heidelberg, Germany

¹³Max-Planck-Insitut für medizinische Forschung, 69120 Heidelberg, Germany

¹⁴Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan

¹⁵Institute of Nuclear Physics, PAS, Radzikowskiego 152, 31-342, Kraków, Poland

¹⁶Department of Physics, University of Hamburg, 20355 Hamburg, Germany

^*Corresponding author: fukuzawa@tagen.tohoku.ac.jp