Quantum-spin-liquid states in the two-dimensional kagome antiferromagnets ZnxCu4−x(OD)6Cl2

Lee, S. H.; Kikuchi, H.; Qiu, Yiming; Lake, B.; Huang, Q.; Habicht, K.; Kiefer, K.

doi:10.1038/nmat1986

Cited by 217 publications

(254 citation statements)

References 26 publications

Supporting

Mentioning

235

Contrasting

Unclassified

Order By: Relevance

“…This has been observed in the iron jarosites, where the iron ions sit on a kagome lattice (Matan et al, 2006). A sharp mode has also been seen in clinoatacamite (Kim et al, 2008;Lee et al, 2007;Wills et al, 2009) and is thought to have the same origin. But this mode is not present in herbertsmithite, rather one sees a broad continuum thought to be due to spinons (Han, Helton et al, 2012).…”

Section: The Kagome Lattice and Zero Modesmentioning

confidence: 77%

Colloquium : Herbertsmithite and the search for the quantum spin liquid

2016

View full text Add to dashboard Cite

Quantum spin liquids form a novel class of matter where, despite the existence of strong exchange interactions, spins do not order down to the lowest measured temperature. Typically, these occur in lattices that act to frustrate the appearance of magnetism. In two dimensions, the classic example is the kagome lattice composed of corner sharing triangles. There are a variety of minerals whose transition metal ions form such a lattice. Hence, a number of them have been studied, and were then subsequently synthesized in order to obtain more pristine samples. Of particular note was the report in 2005 by Dan Nocera's group of the synthesis of herbertsmithite, composed of a lattice of copper ions sitting on a kagome lattice, which indeed does not order down to the lowest measured temperature despite the existence of a large exchange interaction of 17 meV. Over the past decade, this material has been extensively studied, yielding a number of intriguing surprises that have in turn motivated a resurgence of interest in the theoretical study of the spin 1 2 Heisenberg model on a kagome lattice. In this colloquium article, I will review these developments, and then discuss potential future directions, both experimental and theoretical, as well as the challenge of doping these materials with the hope that this could lead to the discovery of novel topological and superconducting phases.

show abstract

Section: The Kagome Lattice and Zero Modesmentioning

confidence: 77%

Colloquium : Herbertsmithite and the search for the quantum spin liquid

2016

View full text Add to dashboard Cite

show abstract

“…20). In contrast, the off-stoichiometric so-called paratacamites of formula Zn x Cu 4 − x (OH) 6 Cl 2 assume partly frozen states at LT, with two magnetic transitions finally observed at 18.1 and 6.5 K for the end member (x = 0), clinoatacamite 4,[21][22][23] . The tendency to magnetic order in paratacamites may be induced by interplane couplings through Cu defect spins at the Zn site between the kagomé layers, as well as the likely presence of a sizable Dzyaloshinsky-Moriya term.…”

Section: Discussionmentioning

confidence: 98%

Orbital switching in a frustrated magnet

et al. 2012

View full text Add to dashboard Cite

The orbital is one of the four fundamental degrees of freedom in a solid, besides spin, charge and lattice. In transition metal compounds, it is usually the d orbitals which play deciding roles in determining the crystallographic and physical properties. Here we report the discovery of a unique structural transition in single crystals of the spin-1/2 quasi-kagomé antiferromagnet volborthite, Cu 3 V 2 o 7 (oH) 2 ·2H 2 o, whereby the unpaired electron 'switches' from one d orbital to another upon cooling. This is not a conventional orbital order-disorder transition, but rather an orbital switching that has not previously been observed. The structural transition is found to profoundly affect the magnetic properties of volborthite, because magnetic interactions between Cu spins in the kagomé lattice are considerably modified by the orbital switching. This finding provides us with an interesting example to illustrate the intimate interplay between the orbital degree of freedom and competing magnetic interactions in a frustrated magnet.

show abstract

“…After years of experimental searches, several promising candidates finally emerged, including the "perfect" spin-1 2 kagome lattice herbertsmithite ZnCu 3 ͑OH͒ 6 Cl 2 , which shows no signs of magnetic ordering down to a temperature of 50 mK, despite having a nearestneighbor antiferromagnetic exchange J Ϸ 190 K. [1][2][3] Ever since the successful synthesis of herbertsmithite, 4 a host of experimental techniques have been applied to study the material, including thermodynamic measurements, 1,3,5,6 neutron diffraction, 1,7 NMR, 3,8,9 and SR. 2,3 Unfortunately, the experimental results accumulated thus far are still insufficient to determine if the material is truly a quantum spin liquid. In particular, the valence-bond solid ͑VBS͒ state proposed in Refs.…”

Section: Introductionmentioning

confidence: 99%

Raman signature of the U(1) Dirac spin-liquid state in the spin-12kagome system

Liu

et al. 2010

Phys. Rev. B

View full text Add to dashboard Cite

We followed the Shastry-Shraiman formulation of Raman scattering in Hubbard systems and considered the Raman intensity profile in the spin-1 2 "perfect" kagome lattice herbertsmithite ZnCu 3 ͑OH͒ 6 Cl 2 , assuming the ground state is well-described by the U͑1͒ Dirac spin-liquid state. In the derivation of the Raman T matrix, we found that the spin-chirality term appears in the A 2g channel in the kagome lattice at the t 4 / ͑ i − U͒ 3 order, but ͑contrary to the claims by Shastry and Shraiman͒ vanishes in the square lattice to that order. In the ensuing calculations on the spin-1 2 kagome lattice, we found that the Raman intensity profile in the E g channel is invariant under an arbitrary rotation in the kagome plane, and that in all ͑A 1g , E g , and A 2g ͒ symmetry channels the Raman intensity profile contains broad continua that display power-law behaviors at low energy, with exponent approximately equal to 1 in the A 2g channel and exponent approximately equal to 3 in the E g and the A 1g channels. For the A 2g channel, the Raman profile also contains a characteristic 1 / singularity, which arose in our model from an excitation of the emergent U͑1͒ gauge field.

show abstract

Quantum-spin-liquid states in the two-dimensional kagome antiferromagnets ZnxCu4−x(OD)6Cl2

Cited by 217 publications

References 26 publications

Colloquium : Herbertsmithite and the search for the quantum spin liquid

Colloquium : Herbertsmithite and the search for the quantum spin liquid

Orbital switching in a frustrated magnet

Raman signature of the U(1) Dirac spin-liquid state in the spin-12kagome system

Contact Info

Product

Resources

About