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

Scientific Reports
K M RanjithM Baenitz

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 TN [Formula: see text] 15 K which is of magnetic origin, but with an unusually weak slowing down of fluctuations below TN. 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 zero-field NQR- lines associated with the two isotopes of Br with the nuclear spins of I = 3/2. Quadrupole coupling constants of vQ ≃ 28.5 MHz and 24.7 MHz for 79Br- and 81Br-nuclei are determined from Br-NMR and the asymmetry parameter of the electric field gradient was estimated to η ≃ 0.2. The Br-NQR lines are consistent with our findings from Br-NMR and they are relatively broad, even above TN. This broadening and the relative large η value suggests a symmetry reduction at the Br- site reflecting the presence of a local distortion in the lattice. Our densit...Continue Reading

References

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Citations

Sep 1, 2018·Physical Review Letters·Guang-Yu SunZi Yang Meng
Jan 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ashish Kumar Mall, A K Pramanik

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Methods Mentioned

BETA
nuclear magnetic resonance
NMR
neutron diffraction
neutron scattering
inelastic neutron studies
x-ray diffraction

Software Mentioned

simeq
FPLO

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