Theory of nodal s±-wave pairing symmetry in the Pu-based 115 superconductor family

Das, Tanmoy; Zhu, Jian -Xin; Graf, Matthias J.

doi:10.1038/srep08632

Theory of nodal s^±-wave pairing symmetry in the Pu-based 115 superconductor family

Journal Article · Fri Feb 27 00:00:00 EST 2015 · Scientific Reports

DOI:https://doi.org/10.1038/srep08632· OSTI ID:1193788

Das, Tanmoy ^[1]; Zhu, Jian -Xin ^[1]; Graf, Matthias J. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The spin-fluctuation mechanism of superconductivity usually results in the presence of gapless or nodal quasiparticle states in the excitation spectrum. Nodal quasiparticle states are well established in copper-oxide, and heavy-fermion superconductors, but not in iron-based superconductors. Here, we study the pairing symmetry and mechanism of a new class of plutonium-based high-T_c superconductors and predict the presence of a nodal s⁺⁻ wave pairing symmetry in this family. Starting from a density-functional theory (DFT) based electronic structure calculation we predict several three-dimensional (3D) Fermi surfaces in this 115 superconductor family. We identify the dominant Fermi surface “hot-spots” in the inter-band scattering channel, which are aligned along the wavevector Q = (π, π, π), where degeneracy could induce sign-reversal of the pairing symmetry. Our calculation demonstrates that the s⁺⁻ wave pairing strength is stronger than the previously thought d-wave pairing; and more importantly, this pairing state allows for the existence of nodal quasiparticles. Finally, we predict the shape of the momentum- and energy-dependent magnetic resonance spectrum for the identification of this pairing symmetry.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1193788

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 3 Vol. 5; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Probing Magnetism in the Vortex Phase of PuCoGa 5 by X-Ray Magnetic Circular Dichroism Magnani, N.; Eloirdi, R.; Wilhelm, F. Physical Review Letters, Vol. 119, Issue 15 https://doi.org/10.1103/physrevlett.119.157204	journal	October 2017
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