Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe${}_2$Ge${}_2$

Abstract

We report neutron scattering measurements of single-crystalline YFe${}_2$Ge${}_2$ in the normal state, which has the same crystal structure to the 122 family of iron pnictide superconductors. YFe${}_2$Ge${}_2$ does not exhibit long range magnetic order, but exhibits strong spin fluctuations. Like the iron pnictides, YFe${}_2$Ge${}_2$ displays anisotropic stripe-type antiferromagnetic spin fluctuations at ($\pi$, $0$, $\pi$). More interesting, however, is the observation of strong spin fluctuations at the in-plane ferromagnetic wavevector ($0$, $0$, $\pi$). These ferromagnetic spin fluctuations are isotropic in the ($H$, $K$) plane, whose intensity exceeds that of stripe spin fluctuations. Both the ferromagnetic and stripe spin fluctuations remain gapless down to the lowest measured energies. Our results naturally explain the absence of magnetic order in YFe${}_2$Ge${}_2$ and also imply that the ferromagnetic correlations may be a key ingredient for iron-based materials.

arXiv comment5 pages, 4 figures

References in corpus (25)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Linear spin wave theory for single-Q incommensurate magnetic structures
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Strong Interplay between Stripe Spin Fluctuations, Nematicity and Superconductivity in FeSe
• Evidence for incommensurate spin fluctuations in Sr_2RuO_4
• HORACE: software for the analysis of data from single crystal spectroscopy experiments at time-of-flight neutron instruments
• Magnetic ground state of FeSe
• Inelastic neutron scattering study of magnetic excitations in Sr${}_2$RuO${}_4$
• Anisotropic magnetization, specific heat and resistivity of RFe2Ge2 single crystals
• Absolute cross-section normalization of magnetic neutron scattering data
• Unconventional superconductivity in the layered iron germanide YFe${}_2$Ge${}_2$
• Fermi liquid breakdown and evidence for superconductivity in YFe${}_2$Ge${}_2$
• Superconductivity and Magnetism in YFe${}_2$Ge${}_2$
• Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
• Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
• 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
• Nearly ferromagnetic metal state in the collapsed tetragonal phase of YFe${}_2$(Ge,Si)${}_2$

Cited by in corpus (6)

• Competing magnetic orders in quantum critical Sr${}_3$Ru${}_2$O${}_7$
• Unraveling the origin of Kondo-like behavior in the 3$d$-electron heavy-fermion compound YFe${}_2$Ge${}_2$
• Approaching itinerant magnetic quantum criticality through a Hund's coupling induced electronic crossover in the YFe${}_2$Ge${}_2$ superconductor
• Fermi surface and mass renormalization in the iron-based superconductor YFe${}_2$Ge${}_2$
• Spin correlations in the parent phase of Li${}_{1-x}$Fe${}_x$ODFeSe
• Spin Fluctuations in Sr${}_{1.8}$La${}_{0.2}$RuO${}_4$