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  • Letter
  • Open Access

Prediction of pseudogap formation due to d-wave bond-order in organic superconductor κ−(BEDT-TTF)2X

Rina Tazai1, Youichi Yamakawa1, Masahisa Tsuchiizu2, and Hiroshi Kontani1

  • 1Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan
  • 2Department of Physics, Nara Women's University, Nara 630-8506, Japan

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Phys. Rev. Research 3, L022014 – Published 19 May, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L022014

Abstract

Rich hidden unconventional orders with pseudogap formation, such as the intersite bond order (BO), attract increasing attention in condensed matter physics. Here, we investigate the hidden order formation in organic unconventional superconductor κ−(BEDT-TTF)2X. We predict the formation of d-wave BO at wavelength q=QB=(δ,δ) (δ=0.38π) for the first time, based on both the functional renormalization group (fRG) and the density-wave equation theories. The origin of the BO is the quantum interference among antiferromagnetic spin fluctuations. This prediction leads to distinct pseudogap-like reduction in the NMR 1/T1 relaxation rate and in the density-of-states, consistently with essential experimental reports. The present theory would be applicable for other strongly correlated metals with pseudogap formation.

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Phys. Rev. Research 3, L022014– Published 19 May, 2021
  • Received 19 November 2020
  • Revised 3 March 2021
  • Accepted 8 April 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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