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Kapellasite: a kagome quantum spin liquid

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arxiv 1203.6107 v2 pith:25MVW3US submitted 2012-03-27 cond-mat.str-el

Kapellasite: a kagome quantum spin liquid

B. F{\aa}k , E. Kermarrec , L. Messio , B. Bernu , C. Lhuillier , F. Bert , P. Mendels , B. Koteswararao
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F. Bouquet J. Ollivier A. D. Hillier A. Amato R. H. Colman A. S. Wills
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classification cond-mat.str-el
keywords datafrustratedkagomekapellasiteliquidspinantiferromagnetapproach
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Magnetic susceptibility, NMR, muSR, and inelastic neutron scattering measurements show that kapellasite, Cu3Zn(OH)6Cl2, a geometrically frustrated spin-1/2 kagome antiferromagnet polymorphous with the herbertsmithite mineral, is a gapless spin liquid with frustrated interactions showing unusual dynamic short-range correlations of non-coplanar cuboc2 type which persist down to 20 mK. The Hamiltonian is determined from a fit of a high-temperature series expansion to thermodynamical data. The experimental data are compared to theoretical calculations using the Schwinger-boson approach.

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