Finite temperature spin-dynamics and phase transitions in spin-orbital models

Abstract

We study finite temperature properties of a generic spin-orbital model relevant to transition metal compounds, having coupled quantum Heisenberg-spin and Ising-orbital degrees of freedom. The model system undergoes a phase transition, consistent with that of a 2D Ising model, to an orbitally ordered state at a temperature set by short-range magnetic order. At low temperatures the orbital degrees of freedom freeze-out and the model maps on to a quantum Heisenberg model. The onset of orbital excitations causes a rapid scrambling of the spin spectral weight away from coherent spin-waves, which leads to a sharp increase in uniform magnetic susceptibility just below the phase transition, reminiscent of the observed behavior in the Fe-pnictide materials.

4 pages

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Cited by in corpus (50)

• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Nematic and meta-nematic transitions in the iron pnictides
• In-plane electronic anisotropy of underdoped "122" Fe-arsenide superconductors revealed by measurements of detwinned single crystals
• Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
• Orbital Ordering and Unfrustrated $(\pi ,0)$ Magnetism from Degenerate Double Exchange in the Iron Pnictides
• Origin of Orthorhombic Transition, Magnetic Transition, and Shear Modulus Softening in Iron Pnictide Superconductors: Analysis based on the Orbital Fluctuation Theory
• Consistent model of magnetism in ferropnictides
• Nematic State of the Pnictides Stabilized by the Interplay Between Spin, Orbital, and Lattice Degrees of Freedom
• On the origin of non-monotonic doping dependence of the in-plane resistivity anisotropy in Ba(Fe${}_{1-x}{T}_x$)${}_2$As${}_2$, $T$ = Co, Ni and Cu
• Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering
• Orbitally and Magnetically Induced Anisotropy in Iron-based Superconductors
• Spin-state transition in the Fe-pnictides
• Coupling of spin and orbital excitations in the iron-based superconductor FeSe(0.5)Te(0.5)
• Detection of Orbital Fluctuations Above the Structural Transition Temperature in the Iron-Pnictides and Chalcogenides
• Dynamic competition between spin density wave order and superconductivity in underdoped $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Frustrated local moment models for Fe-pnictide magnetism
• Enhancing magnetic stripe order in iron pnictides by RKKY exchange interactions
• Optical conductivity of iron-based superconductors
• Impact of Uniaxial Pressure on Structural and Magnetic Phase Transitions in Electron-Doped Iron Pnictides
• Spin-waves in the $J_{1a}-J_{1b}-J_2$ orthorombic square-lattice Heisenberg models: Application to the iron pnictide materials
• Spin-Driven Nematic Instability of the Multi-Orbital Hubbard Model: Application to Iron-Based Superconductors
• Theory of two magnon Raman scattering in antiferromagnetic iron pnictides
• Universal magnetic and structural behaviors in the iron arsenides
• Origin of electronic dimers in the spin-density wave phase of Fe-based superconductors
• The magnetic and electronic properties of Oxyselenides - influence of transition metal ions and lanthanides
• Symmetry of re-entrant tetragonal phase in Ba1-xNaxFe2As2: Magnetic versus orbital ordering mechanism
• Phase transitions in spin-orbital models with spin-space anisotropies for iron-pnictides: A study through Monte Carlo simulations
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Antiferromagnetic Critical Fluctuations in BaFe${}_2$As${}_2$
• Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting K0.85Fe1.54Se2 (TN=280 K)
• Spin and quadrupolar orders in the spin-1 bilinear-biquadratic model for iron-based superconductors
• Giant biquadratic interaction induced magnetic anisotropy in the iron-based superconductor AxFe2-ySe2
• Competing spin density wave, collinear, and helical magnetism in Fe1+xTe
• Tunneling spectroscopy for probing orbital anisotropy in iron pnictides
• Magnetism of the Fe${}^{2+}$ and Ce${}^{3+}$ sublattices in Ce${}_2$O${}_2$FeSe${}_2$: a combined neutron powder diffraction, inelastic neutron scattering and density functional study
• Phonon Anomalies, Orbital-Ordering and Electronic Raman Scattering in iron-pnictide Ca(Fe0.97Co0.03)2As2: Temperature-dependent Raman Study
• Diverging Nematic Susceptibility, Physical Meaning of T* scale, and Pseudogap in the Spin Fermion Model for Pnictides
• Elementary Excitations due to Orbital Degrees of Freedom in Iron Based Superconductors
• Ising-nematic order in the bilinear-biquadratic model for the iron pnictides
• Brief review on iron-based superconductors: are there clues for unconventional superconductivity?
• Orbital Nematic Order and Interplay with Magnetism in the Two-Orbital Hubbard Model
• Revealing the degree of magnetic frustration by non-magnetic impurities
• Study of antiferromagnetic and nematic phase transitions in $BaF{e}_2(A{s}_{1-x}{P}_x{)}_2$ by AC micro-calorimetry and SQUID magnetometry
• Dispersionless orbital excitations in (Li,Fe)OHFeSe superconductors
• Disorder-Induced Electronic Nematicity
• High impact of spin-nematic order on the lattice domains in thin films of iron-based superconductors
• Phase transitions in a frustrated biquadratic Heisenberg model with coupled orbital degree of freedom for iron-based superconductors
• Gap-like feature in the normal state of $\mathbf{X}(\mathbf{F}{\mathbf{e}}_{1-\mathbf{x}}\mathbf{C}{\mathbf{o}}_{\mathbf{x}}{)}_2\mathbf{A}{\mathbf{s}}_2$, $\mathbf{X}=\mathbf{Ba},\mathbf{Sr}$ and $\mathbf{F}{\mathbf{e}}_{1+\mathbf{y}}\mathbf{Te}$ revealed by Point Contact Spectroscopy
• Electronic spin-triplet nematic with a twist
• Stripping the planar Quantum Compass Model to its basics