Molecular motion and high-temperature paramagnetic phase in κ(BEDT-TTF)2Cu[N(CN)2]Cl

Miko Matsumoto, Yohei Saito, and Atsushi Kawamoto
Phys. Rev. B 90, 115126 – Published 15 September 2014

Abstract

The organic conductor κ(BEDTTTF)2Cu[N(CN)2]Cl has been studied for the examination of the conducting mechanism of the semiconducting behavior at high temperatures by 13CNMR spectroscopy. We found that the temperature dependence of the linewidths and the spin-spin relaxation rate T21 showed a peak structure characterized by the hyperfine coupling constant in this region, suggesting a connection between ethylene motion and conducting electrons similar to that observed in κ(BEDTTTF)2Cu(NCS)2. Although κ(BEDTTTF)2Cu[N(CN)2]Cl salt was thought to be an insulator at high temperature, our findings suggest that all κ-type salts at high temperatures could be in the same phase where the scattering caused by ethylene motion is added to bad metal.

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  • Received 8 October 2013
  • Revised 26 June 2014

DOI:https://doi.org/10.1103/PhysRevB.90.115126

©2014 American Physical Society

Authors & Affiliations

Miko Matsumoto, Yohei Saito, and Atsushi Kawamoto*

  • Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan

  • *atkawa@sci.phys.hokudai.ac.jp

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Vol. 90, Iss. 11 — 15 September 2014

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