Imaging Phase Separation near the Mott Boundary of the Correlated Organic Superconductors κ(BEDTTTF)2X

T. Sasaki, N. Yoneyama, N. Kobayashi, Y. Ikemoto, and H. Kimura
Phys. Rev. Lett. 92, 227001 – Published 2 June 2004

Abstract

Electronic phase separation consisting of the metallic and insulating domains with 50100   μm in diameter is found in the organic Mott system κ[(h8BEDTTTF)1x(d8BEDTTTF)x]2Cu[N(CN)2]Br by means of scanning microregion infrared spectroscopy using the synchrotron radiation. The phase separation appears below the critical end temperature 35–40 K of the first-order Mott transition. The observation of the macroscopic size of the domains indicates a different class of the intrinsic electronic inhomogeneity from the nanoscale one reported in the inorganic Mott systems such as high-Tc copper and manganese oxides.

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  • Received 4 February 2004

DOI:https://doi.org/10.1103/PhysRevLett.92.227001

©2004 American Physical Society

Authors & Affiliations

T. Sasaki1, N. Yoneyama1, N. Kobayashi1, Y. Ikemoto2, and H. Kimura2

  • 1Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
  • 2SPring-8, Japan Science Radiation Research Institute, Mikazuki, Hyogo 679-5198, Japan

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Issue

Vol. 92, Iss. 22 — 4 June 2004

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