High pressure investigation of an organic three-dimensional Dirac semimetal candidate having a diamond lattice

Andhika Kiswandhi, Mitsuhiko Maesato, Shinya Tomeno, Yukihiro Yoshida, Yasuhiro Shimizu, Prashant Shahi, Jun Gouchi, Yoshiya Uwatoko, Gunzi Saito, and Hiroshi Kitagawa
Phys. Rev. B 101, 245124 – Published 5 June 2020

Abstract

(ET)Ag4(CN)5 [ET = BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene] is a rare example of organic conductors that crystallizes in a diamond structure due to the tetrahedral arrangement of neighboring ET molecules. Because each ET has a +1 site charge, the band is half filled, which in combination with strong Coulomb interactions, turn (ET)Ag4(CN)5 into a Mott insulator. Recently, it was realized that this material may realize a nodal Dirac semimetal with a diamondlike lattice, whose state can be induced by suppressing the strong electron correlations. In this report, we present high pressure transport and optical studies on (ET)Ag4(CN)5. Our transport study indicates that the activation energy is highly suppressed by the application of hydrostatic pressure. At high pressures, the system varies from activated behavior into Coulomb gap variable range hopping.

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  • Received 15 February 2020
  • Accepted 5 May 2020

DOI:https://doi.org/10.1103/PhysRevB.101.245124

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Andhika Kiswandhi1,*, Mitsuhiko Maesato1, Shinya Tomeno1, Yukihiro Yoshida1, Yasuhiro Shimizu2, Prashant Shahi3,†, Jun Gouchi3, Yoshiya Uwatoko3, Gunzi Saito1, and Hiroshi Kitagawa1

  • 1Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
  • 2Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
  • 3Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

  • *kiswandhi@issp.u-tokyo.ac.jp; Present address: Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan.
  • Present address: Department of Physics, D.D.U. Gorakhpur University, Gorakhpur 273009, India.

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Issue

Vol. 101, Iss. 24 — 15 June 2020

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