Local response to light excitation in the charge-ordered phase of (EDOTTF)2SbF6

Marina Servol, Nicolas Moisan, Eric Collet, Hervé Cailleau, Wawrzyniec Kaszub, Loïc Toupet, Davide Boschetto, Tadahiko Ishikawa, Alain Moréac, Shinya Koshihara, Mitsuhiko Maesato, Mikio Uruichi, Xiangfeng Shao, Yoshiaki Nakano, Hideki Yamochi, Gunzi Saito, and Maciej Lorenc
Phys. Rev. B 92, 024304 – Published 24 July 2015

Abstract

The family of materials (EDOTTF)2XF6 represents quasi-one-dimensional quarter filled systems exhibiting insulator-to-metal (I-M) phase transition at thermal equilibrium. (EDOTTF)2PF6 is known to undergo a photoinduced I-M conversion with cooperative response to light excitation. Here we use femtosecond pump-probe experiments to study the photoresponse of (EDOTTF)2SbF6 made of a larger counteranion SbF6 compared to the well studied (EDOTTF)2PF6. In the early stage of the photoinduced process, we reveal a multicomponent coherent oscillating feature. The evolution of this feature with excitation density and temperature points to the local nature of the photoswitching in (EDOTTF)2SbF6. At longer time scale, we did not detect the features associated with the transformation to the M phase, albeit observed in the PF6 derivative. We propose a scenario whereby the bigger size of the counteranion in (EDOTTF)2SbF6 hinders the establishment of this transformation at macroscopic scale.

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  • Received 15 October 2014

DOI:https://doi.org/10.1103/PhysRevB.92.024304

©2015 American Physical Society

Authors & Affiliations

Marina Servol1,*, Nicolas Moisan1, Eric Collet1, Hervé Cailleau1, Wawrzyniec Kaszub1, Loïc Toupet1, Davide Boschetto2, Tadahiko Ishikawa3, Alain Moréac1, Shinya Koshihara3, Mitsuhiko Maesato4, Mikio Uruichi5, Xiangfeng Shao6,†, Yoshiaki Nakano6, Hideki Yamochi6, Gunzi Saito4,6,‡, and Maciej Lorenc1

  • 1Institut de Physique de Rennes, UMR 6251 CNRS-University Rennes 1 campus Beaulieu, Rennes, 35042, France
  • 2Laboratoire d'Optique Appliquée, ENSTA ParisTech, CNRS, Ecole polytechnique, Université Paris-Saclay, 828 boulevard des Maréchaux, 91762 Palaiseau cedex, France
  • 3Department of Materials Science, Tokyo Inst. of Technology, 2-12-1, Oh-okayama, Meguro, Tokyo, 152-8551, Japan
  • 4Division of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
  • 5Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
  • 6Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan

  • *To whom correspondence should be addressed: marina.servol@univ-rennes1.fr
  • Present address: State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Tianshui Southern Road 222, Lanzhou 730000, Gansu Province, People's Republic of China.
  • Present address: Faculty of Agriculture, Meijo University, Tempaku-ku, Nagoya 468-8502, Japan and Toyota Physical and Chemical Research Institute, 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan.

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Vol. 92, Iss. 2 — 1 July 2015

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