Test for Pairing Symmetry Based on Spin Fluctuations in the Organic Superconductor κ(BEDTTTF)2X

Jian-Xin Li
Phys. Rev. Lett. 91, 037002 – Published 17 July 2003

Abstract

We propose that the superconducting pairing symmetry of organic superconductors κ(BEDTTTF)2X can be determined by measuring the position in momentum space of the incommensurate peaks of the spin susceptibility. Using the weak coupling BCS theory and including the many-body effects via the random-phase approximation for the Hubbard model on an anisotropic triangular lattice, we show that the position of these peaks is uniquely determined by the pairing symmetry of the superconducting state and the geometry of the Fermi surface. We demonstrate the different incommensurate patterns of spin responses for dx2y2- and dxy-like pairing states. In addition, we find that there is no spin resonance mode in the reasonable range of parameters discussed.

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  • Received 12 November 2002

DOI:https://doi.org/10.1103/PhysRevLett.91.037002

©2003 American Physical Society

Authors & Affiliations

Jian-Xin Li

  • National Laboratory of Solid States of Microstructure and Department of Physics, Nanjing University, Nanjing 210093, China
  • The Interdisciplinary Center of Theoretical Studies, Chinese Academy of Sciences, Beijing 100080, China

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Issue

Vol. 91, Iss. 3 — 18 July 2003

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