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Pressure-induced superconductivity in the antiferromagnet κ(ET)2CF3SO3 with quasi-one-dimensional triangular spin lattice

Hiroshi Ito, Takayuki Asai, Yasuhiro Shimizu, Hiromi Hayama, Yukihiro Yoshida, and Gunzi Saito
Phys. Rev. B 94, 020503(R) – Published 18 July 2016
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Abstract

We report an antiferromagnetic (AF) ordering at ambient pressure and a superconducting transition under pressure for κ(ET)2CF3SO3 [ET=bis(ethylenedithio)tetrathiafulvalene], which has a two-dimensional electronic system with quasi-one-dimensional triangular spin lattice. At ambient pressure, AF ordering was detected at TN=2.5K by H1 NMR, subsequent to two structural phase transitions at 230 and 190 K. Under hydrostatic pressures, metallic behavior appeared above ∼1.1 GPa, and a superconducting transition (maximum onset Tc=4.8K at ∼1.3 GPa) was observed up to 2.2 GPa. Superconductivity was also found under c-axis strain, which reduced t/t, but was absent under b-axis strain which increased t/t.

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  • Received 30 July 2015
  • Revised 22 June 2016

DOI:https://doi.org/10.1103/PhysRevB.94.020503

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hiroshi Ito1, Takayuki Asai1, Yasuhiro Shimizu2, Hiromi Hayama3, Yukihiro Yoshida3, and Gunzi Saito3,4

  • 1Department of Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
  • 2Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
  • 3Faculty of Agriculture, Meijo University, Shiogamaguchi 1-501 Tempaku-ku, Nagoya 468-8502, Japan
  • 4Toyota Physical and Chemical Research Institute, 41-1, Yokomichi, Nagakute, Aichi 480-1192, Japan

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Issue

Vol. 94, Iss. 2 — 1 July 2016

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