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Inelastic neutron scattering studies of the quantum frustrated magnet clinoatacamite, gamma-Cu-2(OD)(3)Cl, a proposed valence bond solid (VBS)

Wills, AS; Perring, TG; Raymond, S; Fak, B; Henry, JY; Telling, M; (2009) Inelastic neutron scattering studies of the quantum frustrated magnet clinoatacamite, gamma-Cu-2(OD)(3)Cl, a proposed valence bond solid (VBS). In: Eremin, I and Brenig, W and Kremer, R and Litterst, J, (eds.) HIGHLY FRUSTRATED MAGNETISM 2008 (HFM 2008). (pp. ? - ?). IOP PUBLISHING LTD Gold open access

Abstract

The frustrated magnet clinoatacamite, gamma-Cu-2(OH)(3)Cl, is attracting a lot of interest after suggestions that at low temperature it forms an exotic quantum state termed a Valence Bond Solid (VBS) made from dimerised Cu2+ (S = 1/2) spins.[12] Key to the arguments surrounding this proposal were suggestions that the kagome planes in the magnetic pyrochlore lattice of clinoatacamite are only weakly coupled, causing the system to behave as a quasi-2-dimensional magnet. This was reasoned from the near95 degrees angles made at the bridging oxygens that mediate exchange between the Cu ions that link the kagome planes.Recent work pointed out that this exchange model is in appropriate for gamma-Cu-2(OH)(3)Cl, where the oxygen is present as a mu(3)-OH.[11] Further, it used symmetry calculations and neutron powder diffraction to show that the low temperature magnetic structure (T < 6 K) was canted and involved significant spin ordering on all the Cu2+ spins, which is in compatible with the interpretation of simultaneous VBS and Neel ordering. Correspondingly, clinoatacamite is best considered a distorted pyrochlore magnet. In this report we show detailed inelastic neutron scattering spectra and revisit the responses of this frustrated quantum magnet.

Type:Proceedings paper
Title:Inelastic neutron scattering studies of the quantum frustrated magnet clinoatacamite, gamma-Cu-2(OD)(3)Cl, a proposed valence bond solid (VBS)
Event:HIGHLY FRUSTRATED MAGNETISM 2008
Location:Technische Univ, Braunschweig, GERMANY
Dates:2008-09-07 - 2008-09-12
Open access status:An open access publication
DOI:10.1088/1742-6596/145/1/012056
Keywords:PYROCHLORE ANTIFERROMAGNET, SPINEL LI2MN2O4, ORDER
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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