Triplet Resonating Valence Bond State and Superconductivity in Hund’s Metals. / Coleman, Piers; KOMIJANI, YASHAR; Koemog, Elio.

In: Physical Review Letters, Vol. 125, No. 7, 077001, 12.08.2020, p. 1-6.

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Abstract

A central idea in strongly correlated systems is that doping a Mott insulator leads to a superconductor by transforming the resonating valence bonds (RVBs) into spin-singlet Cooper pairs. Here, we argue that a spin-triplet RVB (tRVB) state, driven by spatially, or orbitally anisotropic ferromagnetic interactions can provide the parent state for triplet superconductivity. We apply this idea to the iron-based superconductors, arguing that strong onsite Hund's interactions develop intra-atomic tRVBs between the t2g orbitals. On doping, the presence of two iron atoms per unit cell allows these inter-orbital triplets to coherently delocalize onto the Fermi surface, forming a fully gapped triplet superconductor. This mechanism gives rise to a unique staggered structure of onsite pair correlations, detectable as an alternating π phase shift in a scanning tunnelling Josephson microscope.
Original languageEnglish
Article number077001
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Letters
Volume125
Issue number7
DOIs
Publication statusPublished - 12 Aug 2020
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

ID: 38801193