Structure of the frustrated kagomè antiferromagnet Cr-jarosite
Geometrically frustrated spin systems receive much attention due to the existence of exotic states such as spin liquids. We wish to study deuterated Cr-jarosite, KCr3(SO4)2(OD)6, which is a frustrated 2D Kagomé antiferromagnet with S = 3/2 arising from the magnetic Cr(III) ions. Jarosites have historically been hard to synthesize without defects, but new redox-based hydrothermal methods can provide stoichiometric (non-defect) Cr-jarosite samples [Nocera et al, 2004]. The stoichiometry of samples can be quantified using 2H Magic Angle Spinning (MAS) NMR spectroscopy. We have recently synthesized a batch of 240 mg Cr-jarosite powder. By MAS-NMR it has been quantified as having only 0.8% Cr-vacancies, making it almost perfectly stoichimetric. The samples have also been characterized with magnetic susceptibility, yielding a TN = 3.8 K. We wish to perform high-resolution neutron diffraction on the powder at room temperature to perform detailed Rietveld refinement of the structure and of the vacancies.
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LEFMANN Kim and Thomas C. Hansen. (2019). Structure of the frustrated kagomè antiferromagnet Cr-jarosite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-458
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