Magnetic resonance as a local probe for kagome magnetism in Barlowite Cu₄(OH)₆FBr.

ABSTRACT: Temperature- and field-dependent ¹H-, ¹⁹F-, and ^79,81Br-NMR measurements together with zero - field ^79,81Br-NQR measurements on polycrystalline samples of barlowite, Cu₄(OH)₆FBr are conducted to study the magnetism and possible structural distortions on a microscopic level. The temperature dependence of the ^79,81Br-NMR spin-lattice relaxation rates 1/T₁ indicate a phase transition at T_N [Formula: see text] 15 K which is of magnetic origin, but with an unusually weak slowing down of fluctuations below T_N. Moreover, 1/T₁T scales linear with the bulk susceptibility which indicates persisting spin fluctuations down to 2 K. Quadupolare resonance (NQR) studies reveal a pair of

SUBMITTER: Ranjith KM 

PROVIDER: S-EPMC6052016 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature