Competition between commensurate and incommensurate magnetic ordering in Fe(1+y)Te

Abstract

The Fe1+y Te1-x Sex compounds belong to the family of iron-based high temperature superconductors, in which superconductivity often appears upon doping antiferromagnetic parent compounds. Unlike other Fe-based superconductors (in which the antiferromagnetic order is at the Fermi surface nesting wavevector [1/2,1/2,1]), the Fe1+y Te1-x Sex parent compound Fe1+y Te orders at a different wavevector, [1/2, 0, 1/2]. Furthermore, the ordering wavevector depends on y, the occupation of interstitial sites with excess iron; the origin of this behavior is controversial. Using inelastic neutron scattering on Fe1.08 Te, we find incommensurate magnetic fluctuations above the Neel temperature, even though the ordered state is bicollinear and commensurate with gapped spin waves. This behavior can be understood in terms of a competition between commensurate and incommensurate order, which we explain as a lock-in transition caused by the magnetic anisotropy.

References in corpus (15)

• High-temperature superconductivity in iron-based materials
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• Bi-collinear antiferromagnetic order in the tetragonal $\alpha$-FeTe
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Fermi surface topology and low-lying quasiparticle dynamics of parent Fe${}_{1+x}$Te/Se Superconductor by orbital-polarization resolved ARPES
• Magnetic-crystallographic phase diagram of superconducting parent compound Fe${}_{1+x}$Te
• Spin waves in the $(\pi ,0)$ magnetically ordered iron chalcogenide Fe${}_{1.05}$Te
• Interstitial iron tuning of the spin fluctuations in Fe1+xTe
• First-order structural transition in the magnetically ordered phase of Fe1.13Te
• Continuous magnetic and structural phase transitions in Fe1+yTe
• Anisotropic Neutron Spin Resonance in Superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• Magnetoelastic Effects in Iron Telluride

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• Hidden $(\pi ,0)$ instability as an itinerant origin of bicollinear antiferromagnetism in Fe${}_{1+x}$Te
• Solitonic spin-liquid state due to the violation of the Lifshitz condition in Fe${}_{1+y}$Te
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• Mössbauer study of the '11' iron-based superconductors parent compound Fe(1+x)Te
• Synthesis, phase stability, structural and physical properties of 11-type iron chalcogenides
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• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Magnetic surface reconstruction in the van-der-Waals antiferromagnet Fe${}_{1+x}$Te
• Spin-isotropic continuum of spin excitations in antiferromagnetically ordered Fe${}_{1.07}$Te
• Unconventional magnetic phase separation in $\gamma$-CoV${}_2$O${}_6$
• Magnetic orders, excitations, and phase transitions in Fe_1+yTe
• Incommensuration in odd-parity antiferromagnets
• The influence of magnetic order on the magnetoresistance anisotropy of Fe${}_{1+\delta -x}$Cu${}_x$Te
• Acoustic lattice instabilities at the magneto-structural transition in Fe${}_{1.057(7)}$Te