(BEDT-TTF)2Cu2(CN)3 Spin Liquid: Beyond the Average Structure
Pascale Foury-Leylekian,
Vita Ilakovac,
Victor Balédent,
Pierre Fertey,
Alla Arakcheeva,
Ognjen Milat,
Denis Petermann,
Gilles Guillier,
Kazuya Miyagawa,
Kazushi Kanoda,
Pere Alemany,
Enric Canadell,
Silvia Tomic,
Jean-Paul Pouget
Affiliations
Pascale Foury-Leylekian
Laboratory of Solid State Physics, CNRS UMR 8502, Univ. Paris Sud, Paris Saclay University, 91405 Orsay CEDEX, France
Vita Ilakovac
UPMC, LCP-MR, Sorbonne University, CNRS UMR 7614, F-75252 Paris, France
Victor Balédent
Laboratory of Solid State Physics, CNRS UMR 8502, Univ. Paris Sud, Paris Saclay University, 91405 Orsay CEDEX, France
Pierre Fertey
Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, B.P. 48, F-91192 Gif-sur-Yvette, France
Alla Arakcheeva
Laboratory of Condensed Matter, EPFL, CH-1015 Lausanne, Switzerland
Ognjen Milat
Institute of Physics, Bijenička Cesta 46, HR-10000 Zagreb, Croatia
Denis Petermann
Laboratory of Solid State Physics, CNRS UMR 8502, Univ. Paris Sud, Paris Saclay University, 91405 Orsay CEDEX, France
Gilles Guillier
Laboratory of Solid State Physics, CNRS UMR 8502, Univ. Paris Sud, Paris Saclay University, 91405 Orsay CEDEX, France
Kazuya Miyagawa
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
Kazushi Kanoda
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
Pere Alemany
Department of Materials Science and Chemical Physics and Institute of Theoretical and Computational Chemistry (IQTCUB), University of Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
Enric Canadell
Institute of Materials Science of Barcelona (ICMAB-CSIC), Campus de la UAB, 08193 Bellaterra, Spain
Silvia Tomic
Institute of Physics, Bijenička Cesta 46, HR-10000 Zagreb, Croatia
Jean-Paul Pouget
Laboratory of Solid State Physics, CNRS UMR 8502, Univ. Paris Sud, Paris Saclay University, 91405 Orsay CEDEX, France
We present here the first accurate determination of the exact structure of κ-(BEDT-TTF)2Cu2(CN)3. Not only did we show that the room temperature structure used over the last twenty years was incorrect, but we were also able to correctly and precisely determine it. The results of our work provide evidence that the structure presents a triclinic symmetry with two non-equivalent dimers in the unit cell, which implies a charge disproportionation between the dimers. However, structural refinement shows that the charge disproportionation is quite weak at room temperature.
