Ferro-orbital ordering transition in iron telluride Fe${}_{1+y}$Te

Abstract

Fe${}_{1+y}$Te with $y\lesssim 0.05$ exhibits a first-order phase transition on cooling to a state with a lowered structural symmetry, bicollinear antiferromagnetic order, and metallic conductivity, $d\rho /dT>0$. Here, we study samples with $y=0.09(1)$, where the frustration effects of the interstitial Fe decouple different orders, leading to a sequence of transitions. While the lattice distortion is closely followed by \emph{incommensurate} magnetic order, the development of \emph{bicollinear} order and metallic electronic coherence is uniquely associated with a separate hysteretic first-order transition, at a markedly lower temperature, to a phase with dramatically enhanced bond-order wave (BOW) order. The BOW state suggests ferro-orbital ordering, where electronic delocalization in ferromagnetic zigzag chains decreases local spin and results in metallic transport.

5 pages, 4 figures

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• Photoinduced ultrafast dynamics of local nematicity and lattice distortions in FeSe crystals
• Bicollinear Antiferromagnetic Order, Monoclinic Distortion, and Reversed Resistivity Anisotropy in FeTe as a Result of Spin-Lattice Coupling
• Topological Gapless Phases in Non-Symmorphic Antiferromagnets
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
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• Solitonic spin-liquid state due to the violation of the Lifshitz condition in Fe${}_{1+y}$Te
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• Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• "Forbidden" phonon: dynamical signature of bond symmetry breaking in the iron chalcogenides
• Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Magnetic surface reconstruction in the van-der-Waals antiferromagnet Fe${}_{1+x}$Te
• Unexpected Enhancement of Three-Dimensional Low-Energy Spin Correlations in Quasi-Two-Dimensional Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ System at High Temperature
• Interplay of structure, magnetism, and superconductivity in Se substituted iron telluride with excess Fe
• 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
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