Superconductivity and Magnetism in YFe${}_2$Ge${}_2$

Abstract

We report calculations of the electronic structure and magnetic properties of YFe${}_2$Ge${}_2$ and discuss the results in terms of the observed superconductivity near magnetism. We find that YFe${}_2$Ge${}_2$ is a material near a magnetic quantum critical point based on comparison of standard density functional results that predict magnetism with experiment. The band structure and Fermi surfaces are very three dimensional and higher conductivity is predicted in the $c$-axis direction. The magnetism is of Stoner type and is predominately from an in-plane ferromagnetic tendency. The inter-layer coupling is weak giving a perhaps 2D character to the magnetism, which is in contrast to the conductivity and may be important for suppressing the ordering tendency. This is compatible with a triplet superconducting state mediated by spin fluctuations.

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Cited by in corpus (20)

• Unconventional superconductivity in the layered iron germanide YFe${}_2$Ge${}_2$
• Fermi liquid breakdown and evidence for superconductivity in YFe${}_2$Ge${}_2$
• Unconventional sign-changing superconductivity near quantum criticality in YFe${}_2$Ge${}_2$
• Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2
• Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe${}_2$Ge${}_2$
• Non-trivial role of interlayer cation states in iron-based superconductors
• Magnetism in Na-filled Fe-based skutterudites
• Unconventional bulk superconductivity in YFe${}_2$Ge${}_2$ single crystals
• Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe${}_2$Ge${}_2$
• Competing magnetic orders in quantum critical Sr${}_3$Ru${}_2$O${}_7$
• Approaching itinerant magnetic quantum criticality through a Hund's coupling induced electronic crossover in the YFe${}_2$Ge${}_2$ superconductor
• Unraveling the origin of Kondo-like behavior in the 3$d$-electron heavy-fermion compound YFe${}_2$Ge${}_2$
• Composition dependence of bulk superconductivity in YFe2Ge2
• Fermi surface and mass renormalization in the iron-based superconductor YFe${}_2$Ge${}_2$
• Evidence for proximity of YFe${}_2$Si${}_2$ to a magnetic quantum critical point
• Itinerant magnetism in metallic CuFe2Ge2
• Electronic structure of ruthenium-doped iron chalcogenides
• Nearly ferromagnetic metal state in the collapsed tetragonal phase of YFe${}_2$(Ge,Si)${}_2$
• On magnetic structure of CuFe2Ge2: constrains from the 57Fe Mossbauer spectroscopy
• Magnetic competition in iron-based germanide and silicide superconductors