Superconducting Gap Structure of κ(BEDTTTF)2Cu(NCS)2 Probed by Thermal Conductivity Tensor

K. Izawa, H. Yamaguchi, T. Sasaki, and Yuji Matsuda
Phys. Rev. Lett. 88, 027002 – Published 26 December 2001
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Abstract

The thermal conductivity of organic superconductor κ(BEDTTTF)2Cu(NCS)2 (Tc=10.4K) has been studied in a magnetic field rotating within the 2D superconducting planes with high alignment precision. At low temperatures ( T0.5K), a clear fourfold symmetry in the angular variation, which is characteristic of a d-wave superconducting gap with nodes along the directions rotated 45° relative to the b and c axes of the crystal, was resolved. The determined nodal structure is inconsistent with recent theoretical predictions of superconductivity induced by the antiferromagnetic spin fluctuation.

  • Received 25 July 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.027002

©2001 American Physical Society

Authors & Affiliations

K. Izawa1, H. Yamaguchi1, T. Sasaki2, and Yuji Matsuda1

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

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Vol. 88, Iss. 2 — 14 January 2002

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