Spin-Liquid State in the S = 1/2 Hyperkagome Antiferromagnet Na4Ir3O8

Abstract

A spinel related oxide, Na4Ir3O8, was found to have a three dimensional network of corner shared Ir4+ (t2g^5) triangles. This gives rise to an antiferromagnetically coupled S = 1/2 spin system formed on a geometrically frustrated hyperkagome lattice. Magnetization M and magnetic specific heat Cm data showed the absence of long range magnetic ordering at least down to 2 K. The large Cm at low temperatures is independent of applied magnetic field up to 12 T, in striking parallel to the behavior seen in triangular and kagome antiferromagnets reported to have a spin-liquid ground state. These results strongly suggest that the ground state of Na4Ir3O8 is a three dimensional manifestation of a spin liquid.

4 pages, 4 figures

References in corpus (3)

• Spin Liquid State in an Organic Mott Insulator with Triangular Lattice
• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
• Classical antiferromagnet on a hyperkagome lattice

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• Slow spin dynamics in the hyper-honeycomb Lattice [(C2H5)3NH]2Cu2(C2O4)3 revealed by 1H NMR studies
• Quantum spin liquids by geometric lattice design
• Emergent Spin-Singlet Pairing in the Frustrated Kagome Metal Sc${}_3$Mn${}_3$Al${}_7$Si${}_5$
• Evidence for spin liquid behavior in the frustrated three-dimensional $S=1/2$ Heisenberg garnet NaCa${}_2$Cu${}_2$(VO${}_4$)${}_3$
• Implications of electron and hole doping on the magnetic properties of spin-orbit entangled Ca${}_{\text{4}}$IrO${}_{\text{6}}$ from DFT calculations
• Tuning magnetic interactions with nonequilibrium optical phonon populations: a theoretical study
• A S=1/2 vanadium-based geometrically frustrated spinel system Li2ZnV3O8
• Antiferromagnetic Order and Magnetic Frustration in the Honeycomb Heavy-Fermion System Ce(Pt${}_{1-x}$Pd${}_x$)${}_6$Al${}_3$: ${}^{27}$Al and ${}^{195}$Pt NMR Studies
• Signature of Topological Semimetal in Harmonic-honeycomb ReO3
• Electronic Self-Organization in the β-Pyrochlore Oxide CsW2O6
• Ba-substitution induced evolution of structural and magnetic properties of La2-xBaxCoIrO6 double perovskites
• Frustration-induced degenerate spin state with up-up-down-down ordering in corner-connected Heisenberg square-plaquettes
• 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
• Thermal Properties and Instability of a $U(1)$ Spin Liquid on the Triangular Lattice
• Decorated cluster lattices: a natural framework for classical spin liquids and flat bands
• Spin liquid state in a three-dimensional pyrochlore-like frustrated magnet
• Spin liquid and ferroelectricity close to a quantum critical point in PbCuTe${}_2$O${}_6$