Continuum excitations in a spin-supersolid on a triangular lattice

Abstract

Magnetic, thermodynamic, neutron diffraction and inelastic neutron scattering are used to study spin correlations in the easy-axis XXZ triangular lattice magnet K2Co(SeO3)2. Despite the presence of quasi-2D "supersolid" magnetic order, the low-energy excitation spectrum contains no sharp modes and is instead a broad and structured multi-particle continuum. Applying a weak magnetic field drives the system into an m = 1/3 fractional magnetization plateau phase and restores sharp spin wave modes. To some extent, the behavior at zero field can be understood in terms of spin wave decay. However, the presence of clear excitation minima at the M-points of the Brillouin zone suggest that the spinon language may provide a more adequate description, and signals a possible proximity to a Dirac spin liquid state.

References in corpus (19)

• Linear spin wave theory for single-Q incommensurate magnetic structures
• Supersolid hardcore bosons on the triangular lattice
• Spin liquid nature in the Heisenberg $J_1$-$J_2$ triangular antiferromagnet
• Spontaneous Magnon Decays
• Unusual ordered phases of highly frustrated magnets: a review
• Quantum Phase Diagram of the Triangular-Lattice XXZ Model in a Magnetic Field
• Dirac Spin Liquid on the Spin-1/2 Triangular Heisenberg Antiferromagnet
• Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba${}_3$CoSb${}_2$O${}_9$
• Extended quantum critical phase in a magnetized spin-1/2 antiferromagnetic chain
• Chiral Spin Liquid and Quantum Criticality in Extended $S=1/2$ Heisenberg Models on the Triangular Lattice
• The nature of spin excitations in the one-third magnetization plateau phase of Ba${}_3$CoSb${}_2$O${}_9$
• Spin Supersolidity in Nearly Ideal Easy-axis Triangular Quantum Antiferromagnet Na${}_2$BaCo(PO${}_4$)${}_2$
• Avoided quasiparticle decay and enhanced excitation continuum in the spin-1/2 near-Heisenberg triangular antiferromagnet Ba3CoSb2O9
• Supersolidity in the triangular lattice spin-1/2 XXZ model: A variational perspective
• Frustration enhanced by Kitaev exchange in a ${\tilde{\mathbf{j}}}_{\text{eff}}=\frac{1}{2}$ triangular antiferromagnet
• Evidence of Two-Spinon Bound States in the Magnetic Spectrum of Ba${}_3$CoSb${}_2$O${}_9$
• Finite-temperature properties of the easy-axis Heisenberg model on frustrated lattices
• Quantum Spin Supersolid as a precursory Dirac Spin Liquid in a Triangular Lattice Antiferromagnet
• Miniature capacitive Faraday force magnetometer for magnetization measurements at low temperatures and high magnetic fields

Cited by in corpus (24)

• Double Magnon-Roton Excitations in the Triangular-Lattice Spin Supersolid
• Phase Diagram of the Easy-Axis Triangular-Lattice $J_1-J_2$ Model
• Simulating Spin Dynamics of Supersolid States in a Quantum Ising Magnet
• Wannier states and spin supersolid physics in the triangular antiferromagnet K${}_2$Co(SeO${}_3$)${}_2$
• NMR study of supersolid phases in the triangular-lattice antiferromagnet Na2BaCo(PO4)2
• Supersolidity in Rydberg tweezer arrays
• Easy-axis Heisenberg model on the triangular lattice: from supersolid to gapped solid
• From continuum excitations to sharp magnons via transverse magnetic field in the spin-1/2 Ising-like triangular lattice antiferromagnet Na2BaCo(PO4)2
• Spin Seebeck Effect of Triangular-lattice Spin Supersolid
• Modified large-$N$ approach to gapless spin liquids, magnetic orders, and dynamics: Application to triangular lattice antiferromagnets
• Pseudo-Majorana functional renormalization for frustrated XXZ spin-1/2 models with field or magnetization along the spin-Z direction at finite temperature
• NMR evidence of spin supersolid and Pomeranchuk effect behaviors in the triangular-lattice antiferromagnet Rb${}_2$Ni${}_2$(SeO${}_3$)${}_3$
• Slow convergence of spin-wave expansion and magnon dispersion in the 1/3 plateau of the triangular XXZ antiferromagnet
• Emergent Spin Supersolids in Frustrated Quantum Materials
• Dynamics and thermodynamics of the S = 5/2 almost Heisenberg triangular lattice antiferromagnet K2Mn(SeO3)2
• Dissipationless dynamics of spin supersolid states in a spin-1/2 triangular antiferromagnet with impurities
• Gauge flux generations of weakly magnetized Dirac spin liquid in a kagomé lattice
• Sharp spectroscopic fingerprints of disorder in an incompressible magnetic state
• The anisotropic Heisenberg model close to the Ising limit: triangular lattice vs. effective models
• Non-linear spin wave theory in the strong easy-axis limit of the triangular XXZ model
• Canted ferromagnetic order in a distorted triangular-lattice magnet Na${}_2$SrCo(VO${}_4$)${}_2$
• Quantum spin liquid ground state with the evidence of roton-like excitations at elevated temperatures in the triangular-lattice delafossite YbCuSe${}_2$
• Unconventional Spin Dynamics and Supersolid Excitations in the Triangular-Lattice XXZ Model
• Crystal field splittings and magnetic ground state of the square-lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 with Jeff = 1/2