Giant Magnetocaloric Effect in Spin Supersolid Candidate Na${}_2$BaCo(PO${}_4$)${}_2$

Abstract

Supersolid, an exotic quantum state of matter that consists of particles forming an incompressible solid structure while simultaneously showing superfluidity of zero viscosity [1], is one of the long-standing pursuits in fundamental research [2, 3]. Although the initial report of ${}^4$He supersolid turned out to be an artifact [4], this intriguing quantum matter has inspired enthusiastic investigations into ultracold quantum gases [5-8]. Nevertheless, the realization of supersolidity in condensed matter remains elusive. Here we find evidence for a quantum magnetic analogue of supersolid -- the spin supersolid -- in the recently synthesized triangular-lattice antiferromagnet Na${}_2$BaCo(PO${}_4$)${}_2$ [9]. Notably, a giant magnetocaloric effect related to the spin supersolidity is observed in the demagnetization cooling process, manifesting itself as two prominent valley-like regimes, with the lowest temperature attaining below 100 mK. Not only is there an experimentally determined series of critical fields but the demagnetization cooling profile also shows excellent agreement with the theoretical simulations with an easy-axis Heisenberg model. Neutron diffractions also successfully locate the proposed spin supersolid phases by revealing the coexistence of three-sublattice spin solid order and interlayer incommensurability indicative of the spin superfluidity. Thus, our results indicate a strong entropic effect of the spin supersolid phase in a frustrated quantum magnet and open up a viable and promising avenue for applications in sub-Kelvin refrigeration, especially in the context of persistent concerns about helium shortages [10, 11].

19 pages, 13 figures

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Cited by in corpus (57)

• Sub-unity superfluid fraction of a supersolid from self-induced Josephson effect
• Kitaev Quantum Spin Liquids
• Double Magnon-Roton Excitations in the Triangular-Lattice Spin Supersolid
• Continuum of spin excitations in an ordered magnet
• Phase Diagram of the Easy-Axis Triangular-Lattice $J_1-J_2$ Model
• Rare-Earth Chalcogenides: An Inspiring Playground For Exploring Frustrated Magnetism
• Adiabatic demagnetization refrigeration with antiferromagnetically ordered NaGdP${}_2$O${}_7$
• Simulating Spin Dynamics of Supersolid States in a Quantum Ising Magnet
• Observation of supersolid-like sound modes in a driven quantum gas
• Anomalous continuum scattering and higher-order van Hove singularity in the strongly anisotropic S = 1/2 triangular lattice antiferromagnet
• Wannier states and spin supersolid physics in the triangular antiferromagnet K${}_2$Co(SeO${}_3$)${}_2$
• Magnetism of $\mathrm{NaYb}{\mathrm{S}}_2$: From finite temperatures to ground state
• Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets
• Zeeman split Kramers doublets in spin-supersolid candidate Na${}_2$BaCo(PO${}_4$)${}_2$
• Structural, magnetic and magnetocaloric properties of triangular-lattice transition-metal phosphates
• U(1) Dirac quantum spin liquid candidate in triangular-lattice antiferromagnet CeMgAl${}_{11}$O${}_{19}$
• Synchronization in rotating supersolids
• Spiral spin liquid in a frustrated honeycomb antiferromagnet: A single-crystal study of GdZnPO
• 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
• Successive magnetic transitions in the spin-5/2 easy-axis triangular-lattice antiferromagnet Na${}_2$BaMn(PO${}_4$)${}_2$: A neutron diffraction study
• From continuum excitations to sharp magnons via transverse magnetic field in the spin-1/2 Ising-like triangular lattice antiferromagnet Na2BaCo(PO4)2
• Structural and magnetic characterization of CeTa${}_7$O${}_{19}$ and YbTa${}_7$O${}_{19}$ with two-dimensional pseudospin-1/2 triangular lattice
• Antiferromagnetic ordering and critical behavior induced giant magnetocaloric effect in distorted kagome lattice Gd${}_3$BWO${}_9$
• Emergent Berezinskii-Kosterlitz-Thouless and Kugel-Khomskii physics in the triangular lattice bilayer colbaltate
• Spin Seebeck Effect of Triangular-lattice Spin Supersolid
• Anomalous dispersion of shear waves in dipolar supersolids
• Giant Magnetocaloric Effect in a Honeycomb Spiral Spin-Liquid Candidate
• Pseudo-Majorana functional renormalization for frustrated XXZ spin-1/2 models with field or magnetization along the spin-Z direction at finite temperature
• Supersolid Phase in the Diluted Holstein Model
• Residual entropy from temperature incremental Monte Carlo method
• NMR evidence of spin supersolid and Pomeranchuk effect behaviors in the triangular-lattice antiferromagnet Rb${}_2$Ni${}_2$(SeO${}_3$)${}_3$
• Spin structures and phase diagrams of the spin-$\frac{5}{2}$ triangular-lattice antiferromagnet Na${}_2$BaMn(PO${}_4$)${}_2$ under magnetic field
• Field tunable BKT and quantum phase transitions in spin-1/2 triangular lattice antiferromagnet
• Interleaved bond frustration in a triangular lattice antiferromagnet
• Emergent Spin Supersolids in Frustrated Quantum Materials
• Frustration and chirality in three-dimensional trillium lattices: Insights and Perspectives
• Frustrated Rydberg Atom Arrays Meet Cavity-QED: Emergence of the Superradiant Clock Phase
• Interplay of short-range bond order and A-type antiferromagnetic order in metallic triangular lattice GdZn${}_3$P${}_3$
• Relaxation Critical Dynamics with Emergent Symmetry
• Finite-time scaling with two characteristic time scales: Driven critical dynamics with emergent symmetry
• Exact diagonalization study of triangular Heisenberg model with four-spin ring-exchange interaction
• Dissipationless dynamics of spin supersolid states in a spin-1/2 triangular antiferromagnet with impurities
• The anisotropic Heisenberg model close to the Ising limit: triangular lattice vs. effective models
• Ising Supercriticality and Universal Magnetocalorics in Spiral Antiferromagnet Nd${}_3$BWO${}_9$
• Possible Bose-Einstein condensation of magnons in a S = 5/2 honeycomb lattice
• Field-induced magnetic order in DyTa${}_7$O${}_{19}$ with two-dimensional pseudospin-$\frac{1}{2}$ triangular lattice
• Canted ferromagnetic order in a distorted triangular-lattice magnet Na${}_2$SrCo(VO${}_4$)${}_2$
• Crystal field splittings and magnetic ground state of the square-lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 with Jeff = 1/2
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• Spiral spin liquid resilient to quantization in the frustrated honeycomb antiferromagnet GdZnPO
• Unconventional Spin Dynamics and Supersolid Excitations in the Triangular-Lattice XXZ Model
• Exploring Low-Dimensional Magnetism in Cobalt Vanadates, $A$CoV${}_2$O${}_7$~($A$~=~Ca, Sr) : Crystal Growth and Magnetic Properties of Effective Spin-1/2 Zigzag Chains
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• Spin amplitude wave due to dipole-quadrupole hybridization in spin-1 pyrochlore magnets