Nodeless superconducting gap induced by odd parity pair density wave in underdoped cuprates

Das, T (2020) Nodeless superconducting gap induced by odd parity pair density wave in underdoped cuprates. In: Annals of Physics, 420 .

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Abstract

We present a theoretical model to show that the transition from an antiferromagnetic (AFM) phase to the dx2�y2-wave superconductivity occurs through a robust companion of a finite momentum pairing between (k,�) and (�k�Q,�) electrons, namely a pair-density wave (PDW) state, where Q=(�,�) is the AFM wavevector. Interestingly, the spatial structure of the PDW is constrained to be a p+ip-wave symmetry, which follows pk=p�k�Q under fermions exchange in cuprates, dictating a spin�singlet pairing. Furthermore, the PDW state produces a fully gapped quasiparticle spectrum which explains recent observations of the fully gapped quasiparticle structure of lightly doped cuprates in the hole doping side. We study the stability of all three phases within the self-consistent mean-field theory. Finally, we calculate the superfluid density to propose its exponential temperature dependence as a test to the superconducting origin of this fully gapped state, while the phase modulation of the PDW state can be visualized by scanning probes. © 2020 Elsevier Inc.

Item Type:	Journal Article
Publication:	Annals of Physics
Publisher:	Academic Press Inc.
Additional Information:	Copy right for this article belongs to Academic Press Inc.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	13 Oct 2020 07:28
Last Modified:	13 Oct 2020 07:28
URI:	http://eprints.iisc.ac.in/id/eprint/66083

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