Quantum magnetisms in uniform triangular lattices Li2AMo3O8 (A = In, Sc)

Abstract

Molecular based spin-1/2 triangular lattice systems such as LiZn${}_2$Mo${}_3$O${}_8$ have attracted research interest. Distortions, defects, and intersite disorder are suppressed in such molecular-based magnets, and intrinsic geometrical frustration gives rise to unconventional and unexpected ground states. Li${}_2$$A$Mo${}_3$O${}_8$ ($A$ = In or Sc) is such a compound where spin-1/2 Mo${}_3$O${}_{13}$ clusters in place of Mo ions form the uniform triangular lattice. Their ground states are different according to the $A$ site. Li${}_2$InMo${}_3$O${}_8$ undergoes conventional $120^{\circ }$ long-range magnetic order below $T_{\text{N}}=12$~K whereas isomorphic Li${}_2$ScMo${}_3$O${}_8$ exhibits no long-range magnetic order down to 0.5~K. Here, we report exotic magnetisms in Li${}_2$InMo${}_3$O${}_8$ and Li${}_2$ScMo${}_3$O${}_8$ investigated by muon spin rotation ($\mu$SR) and inelastic neutron scattering (INS) spectroscopies using polycrystalline samples. Li${}_2$InMo${}_3$O${}_8$ and Li${}_2$ScMo${}_3$O${}_8$ show completely different behaviors observed in both $\mu$SR and INS measurements, representing their different ground states. Li${}_2$InMo${}_3$O${}_8$ exhibits spin wave excitation which is quantitatively described by the nearest neighbor anisotropic Heisenberg model based on the $120^{\circ }$ spin structure. In contrast, Li${}_2$ScMo${}_3$O${}_8$ undergoes short-range magnetic order below 4~K with quantum-spin-liquid-like magnetic fluctuations down to the base temperature. Origin of the different ground states is discussed in terms of anisotropies of crystal structures and magnetic interactions.

arXiv commentSci. Rep. 9, 1826 (2019)

References in corpus (36)

• Quantum Spin Liquids
• Fractionalized excitations in the spin liquid state of a kagomé lattice antiferromagnet
• Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
• Quantum magnetism in the paratacamite family: towards an ideal kagome lattice
• Long range Neel order in the triangular Heisenberg model
• Variational study of triangular lattice spin-1/2 model with ring exchanges and spin liquid state in κ-(ET)_2 Cu_2 (CN)_3
• Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4
• U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
• Evidence for a spinon Fermi surface in a triangular lattice quantum spin liquid candidate
• Neel order in square and triangular lattice Heisenberg models
• Gapless quantum spin liquid ground state in the two-dimensional spin-1/2 triangular antiferromagnet YbMgGaO${}_4$
• Experimental Realization of Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet
• Spin liquid nature in the Heisenberg $J_1$-$J_2$ triangular antiferromagnet
• Spin-waves in triangular lattice antiferromagnet: decays, spectrum renormalization, and singularities
• $\mu$SR evidence for the U(1) quantum spin liquid ground state in the triangular antiferromagnet YbMgGaO${}_4$
• A new high-temperature quantum spin liquid with polaron spins
• Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet
• High pressure sequence of Ba_3NiSb_2O_9 structural phases: new $S=1$ quantum spin-liquids based on Ni^{2+}
• Possible valence-bond condensation in the frustrated cluster magnet LiZn2Mo3O8
• Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba${}_3$CoSb${}_2$O${}_9$
• Gapless spin liquid ground state in the S=1/2 vanadium oxyfluoride kagome antiferromagnet [NH4]2[C7H14N][V7O6F18]
• Quantum spin-liquid behavior in the spin-1/2 random Heisenberg antiferromagnet on the triangular lattice
• Flat spin wave dispersion in a triangular antiferromagnet
• Phase diagram of the classical Heisenberg antiferromagnet on a triangular lattice in applied magnetic field
• Molecular Quantum Magnetism in LiZn2Mo3O8
• Spin wave analysis to the spatially-anisotropic Heisenberg antiferromagnet on triangular lattice
• Absolute cross-section normalization of magnetic neutron scattering data
• Site-Dilution in quasi one-dimensional antiferromagnet Sr2(Cu1-xPdx)O3: reduction of Neel Temperature and spatial distribution of ordered moment sizes
• Spin Liquid Ground State in the Frustrated Kagome Antiferromagnet MgCu3(OH)6Cl2
• Local magnetism and spin correlations in the geometrically frustrated cluster magnet LiZn${}_2$Mo${}_3$O${}_8$
• Emergent honeycomb lattice in LiZn2Mo3O8
• Evidence for a spinon Fermi surface in the triangular S=1 quantum spin liquid Ba${}_3$NiSb${}_2$O${}_9$
• Cluster Mott insulators and two Curie-Weiss regimes on an anisotropic Kagome lattice
• Tunable quantum spin liquidity in the 1/6th-filled breathing kagome lattice
• Instabilities of Spin-Liquid States in a Quantum Kagome Antiferromagnet
• How to measure a spinon Fermi surface

Cited by in corpus (8)

• Orbital effects in solids: basics, recent progress and opportunities
• Quantum spin liquid and cluster Mott insulator phases in the Mo${}_3$O${}_8$ magnets
• Clusterization transition between cluster Mott insulators on a breathing Kagomé lattice
• Molecular Orbital Electronic Instability in the van der Waals Kagome Semiconductor Nb${}_3$Cl${}_8$: Exploring Future Directions
• Light-induced switching of magnetic order in the anisotropic triangular-lattice Hubbard model
• Impact of Oxidation State on the Valence-bond-glass Physics in the lithium-intercalated Mo${}_3$O${}_8$ Cluster Mott Insulators
• Specific heat and susceptibility of S=1/2 antiferromagnets on square, triangular, and kagome lattices
• Magnetic ordering of the Mo${}_3$O${}_8$-type cluster Mott insulator Na${}_3$Sc${}_2$(MoO${}_4$)${}_2$Mo${}_3$O${}_8$ with spin-1/2 triangular lattice prepared via optimal synthesis