Theory for Magnetism and Triplet Superconductivity in LiFeAs

Abstract

Superconducting pnictides are widely found to feature spin-singlet pairing in the vicinity of an antiferromagnetic phase, for which nesting between electron and hole Fermi surfaces is crucial. LiFeAs differs from the other pnictides by (i) poor nesting properties and (ii) unusually shallow hole pockets. Investigating magnetic and pairing instabilities in an electronic model that incorporates these differences, we find antiferromagnetic order to be absent. Instead we observe almost ferromagnetic fluctuations which drive an instability toward spin-triplet p-wave superconductivity.

Published version

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Cited by in corpus (14)

• Crossover from weak to strong pairing in unconventional superconductors
• Spin fluctuations in LiFeAs observed by neutron scattering
• Signature of the Leggett mode in the A1g Raman response: from MgB2 to iron-based superconductors
• Time of life as it is in LiFeAs
• Magnetic order in orbital models of the iron pnictides
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
• Molecular Beam Epitaxy Growth of Superconducting LiFeAs Film on SrTiO3(001) Substrate
• Anomalous superconducting state in LiFeAs implied by the ${}^{75}$As Knight shift measurement
• Interband Quasiparticle Scattering in Superconducting LiFeAs Reconciles Photoemission and Tunneling Measurements
• Cooper Pairing in Insulating Valence Band in Fe-Based Superconductors
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs