ISCOM 2011 – Contributed Article

Charge disproportionation in (TMTTF)2X (X = PF6, AsF6 and SbF6) investigated by infrared spectroscopy

  1. Tobias Knoblauch*,
  2. Martin Dressel

Article first published online: 28 MAR 2012

DOI: 10.1002/pssc.201100729

Issue

physica status solidi (c)

physica status solidi (c)

Special Issue: 9th International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets (ISCOM 2011); see further papers in Phys. Status Solidi B 249, No. 5 (2012) • 11th International Conference on Physics of Light–Matter Coupling in Nanostructures (PLMCN11); see further papers in Phys. Status Solidi B 249, No. 5 (2012)

Volume 9, Issue 5, pages 1158–1160, May 2012

Additional Information

How to Cite

Knoblauch, T. and Dressel, M. (2012), Charge disproportionation in (TMTTF)2X (X = PF6, AsF6 and SbF6) investigated by infrared spectroscopy. Phys. Status Solidi C, 9: 1158–1160. doi: 10.1002/pssc.201100729

Author Information

  1. 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

*Phone: +49 711 685 64906

Publication History

  1. Issue published online: 3 MAY 2012
  2. Article first published online: 28 MAR 2012
  3. Manuscript Revised: 28 OCT 2011
  4. Manuscript Accepted: 28 OCT 2011
  5. Manuscript Received: 14 OCT 2011

Funded by

  • Carl-Zeiss-Stiftung
  • Deutsche Forschungsgemeinschaft (DFG)

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Keywords:

  • TMTTF;
  • charge order;
  • infrared properties;
  • charge disproportionation

Abstract

The charge-transfer salts (TMTTF)2X (X = PF6, AsF6 and SbF6) undergo a charge-order transition at different temperatures TCO. We have performed infrared measurements on the ac plane with light polarized in the c direction in the temperature range from 290 down to 10 K. Below TCO, we report the splitting of the ν28 (B1u) mode including the charge sensitive C=C double bond.

From the spectra, we respectively derived a charge disproportionation of 2δ = 0.15 e, 0.21 e and 0.29 e for (TMTTF)2PF6, (TMTTF)2AsF6 and (TMTTF)2SbF6. The temperature-dependent development of 2δ exhibits a steep increase below TCO resembling a mean-field behaviour. We compare our results with previous infrared and NMR values. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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