An ionothermally prepared S = 1/2 vanadium oxyfluoride kagome lattice

Abstract

Frustrated magnetic lattices offer the possibility of many exotic ground states that are of great fundamental importance. Of particular significance is the hunt for frustrated spin-1/2 networks as candidates for quantum spin liquids, which would have exciting and unusual magnetic properties at low temperatures. The few reported candidate materials have all been based on d(9) ions. Here, we report the ionothermal synthesis of [NH(4)](2)[C(7)H(14)N][V(7)O(6)F(18)], an inorganic-organic hybrid solid that contains a S = 1/2 kagome network of d(1) V(4+) ions. The compound exhibits a high degree of magnetic frustration, with significant antiferromagnetic interactions but no long-range magnetic order or spin-freezing above 2 K, and appears to be an excellent candidate for realizing a quantum spin liquid ground state in a spin-1/2 kagome network.

Extension of the zinc paratacamite phase diagram: Probing the effect of spin vacancies in anS=12kagome antiferromagnet

“…Because the relaxation rate for x = 1.16 is so small, β cannot be determined with the same accuracy as for x = 1, but it does remain >1. A similar trend in relaxation rate as a function of the composition was observed in a study involving the Mg analog of zinc paratacamite, Mg x Cu 4−x (OH) 6 Cl 2 .…”

“…The mineral herbertsmithite, the x = 1 member of the zinc paratacamite family Zn x Cu 4−x (OH) 6 Cl 2 with 0 x 1, has attracted widespread attention as a Mott insulator in which the localized, antiferromagnetically coupled S = 1/2 spins are geometrically frustrated. [1][2][3][4] When antiferromagnetically coupled spins are arranged in three-dimensional (3D) lattices based on tetrahedra or 2D lattices based on triangles, then these spins cannot align antiferromagnetically with all neighboring spins.…”

“…To confirm the presence of diamagnetic Zn 2+ ions on the kagome lattice for herbertsmithite [Zn x Cu 4−x (OH) 6 Cl 2 , x = 1] and to understand how they affect the cooperative properties of the S = 1/2 kagome antiferromagnet, we synthesized samples with 1 < x < 1.2 using a modified synthesis. These samples are compared with other compositions, x = 0.85, 0.9, and 1.0.…”

Carbon Kagome Lattice and Orbital-Frustration-Induced Metal-Insulator Transition for Optoelectronics

“…Experimentally available Kagome lattices to date are either organic complexes [16][17][18][19][20] or optical lattices [4,21,22]. In these systems, spin frustration and its related physical phenomena have been studied and observed extensively.…”

Novel S = 1/2 Kagome Lattice Materials: Cs2TiCu3F12 and Rb2TiCu3F12

“…Particular interest has been focused on kagome lattice compounds containing S = ½ ions [3][4][5][6]-for example, Cu 2+ and V…”