Continuum of spin excitations in an ordered magnet

Abstract

Continuum of spin excitations observed in inelastic neutron scattering experiments are often considered as a strong evidence of quantum spin liquid formation. When quantum spin liquid is indeed the ground state of a disorder-free magnetic compound, the elementary excitation is no longer the conventional spin waves (magnons). Instead, the magnons fractionalize into spinons, leaving only a two-spinon continuum detectable in inelastic neutron scattering experiments. For a clean ordered antiferromagnet, it was unclear if we can observe a continuous spectrum similar to the ones in a quantum spin liquid state. Here we show that the magnetically ordered state in Na${}_2$BaCo(PO${}_4$)${}_2$ is able to host a spin excitation continuum induced by strong quantum fluctuations. Thus, a second thought is necessary when concluding such continuum as signature of quantum spin liquid in new material explorations.

22 pages,9 figures

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Cited by in corpus (14)

• Simulating Spin Dynamics of Supersolid States in a Quantum Ising Magnet
• NMR study of supersolid phases in the triangular-lattice antiferromagnet Na2BaCo(PO4)2
• Easy-axis Heisenberg model on the triangular lattice: from supersolid to gapped solid
• Possible Observation of Quadrupole Waves in Spin Nematics
• 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
• Field tunable BKT and quantum phase transitions in spin-1/2 triangular lattice antiferromagnet
• 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
• Interplay of short-range bond order and A-type antiferromagnetic order in metallic triangular lattice GdZn${}_3$P${}_3$
• Dissipationless dynamics of spin supersolid states in a spin-1/2 triangular antiferromagnet with impurities
• Non-linear spin wave theory in the strong easy-axis limit of the triangular XXZ model
• Ising spin ladders of orthopyroxene CoGeO${}_3$