Resonant inelastic x-ray scattering probes the electron-phonon coupling in the spin liquid κ-(BEDT-TTF)2Cu2(CN)3

V. Ilakovac, S. Carniato, P. Foury-Leylekian, S. Tomić, J.-P. Pouget, P. Lazić, Y. Joly, K. Miyagawa, K. Kanoda, and A. Nicolaou
Phys. Rev. B 96, 184303 – Published 17 November 2017

Abstract

Resonant inelastic x-ray scattering at the N K edge reveals clearly resolved harmonics of the anion plane vibrations in the κ-(BEDT-TTF)2Cu2(CN)3 spin-liquid insulator. Tuning the incoming light energy at the K edge of two distinct N sites permits us to excite different sets of phonon modes. The cyanide (CN) stretching mode is selected at the edge of the ordered N sites which are more strongly connected to the bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) molecules, while positionally disordered N sites show multimode excitation. Combining measurements with calculations on an anion plane cluster permits us to estimate the site-dependent electron-phonon coupling of the modes related to nitrogen excitation.

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  • Received 27 July 2017

DOI:https://doi.org/10.1103/PhysRevB.96.184303

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

V. Ilakovac1,2,*, S. Carniato1, P. Foury-Leylekian3, S. Tomić4, J.-P. Pouget3, P. Lazić5, Y. Joly6, K. Miyagawa7, K. Kanoda7, and A. Nicolaou8

  • 1Sorbonne Universités, UPMC, Université Paris 6, CNRS UMR 7614, Laboratoire de Chimie Physique–Matière et Rayonnement, Paris, France
  • 2Université de Cergy Pontoise, Département de Physique, F-95031 Cergy-Pontoise, France
  • 3Laboratoire de Physique de Solides, CNRS UMR 8502, Université Paris Sud, Université Paris Saclay, Orsay, France
  • 4Institut za fiziku Bijenička cesta 46, HR-10000 Zagreb, Croatia
  • 5Ruder Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia
  • 6Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38042 Grenoble, France
  • 7Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 8Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, Boîte Postale 48, F-91192 Gif-sur-Yvette, France

  • *vita.ilakovac-casses@upmc.fr

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Issue

Vol. 96, Iss. 18 — 1 November 2017

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