Why MgFeGe is not a superconductor

Abstract

The recently synthesized MgFeGe compound is isostructural and isoelectronic with superconducting LiFeAs. Both materials are paramagnetic metals at room temperature. Inspection of their electronic structures without spin polarization reveals hardly any difference between the two. This fact was interpreted as evidence against popular theories relating superconductivity in Fe-based materials with spin fluctuations. We show that in the magnetic domain the two compounds are dramatically different, and the fact that MgFeGe does not superconduct, is, on the contrary, a strong argument in favor of theories based on spin fluctuations.

4 pages, 4 figures, submitted

References in corpus (6)

• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• The challenge of unravelling magnetic properties in LaFeAsO
• Proximity of LaOFeAs to a magnetic instability
• Itinerant Nature of Magnetism in Iron Pnictides: A first principles study
• Fermi surface topology of LaFePO and LiFeP
• Contrast of LiFeAs with isostructural, isoelectronic, and non-superconducting MgFeGe

Cited by in corpus (7)

• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
• Magnetic interactions in iron superconductors: A review
• Iron-based superconductivity extended to the novel silicide LaFeSiH
• Non-trivial role of interlayer cation states in iron-based superconductors
• Role of Hydrogen in the Electronic Properties of CaFeAsH-based Superconductors
• Possible Way to Make MgFeGe a New Fe-based Superconductor
• Magnetic competition in iron-based germanide and silicide superconductors