Abstract
We report a comprehensive study investigating the magnetic ordering properties of the quasi-two-dimensional breathing kagome lattice compound Pb(OF)Cu3(SeO3)2(NO3) using neutron diffraction and thermodynamic measurements. A long-range magnetic order emerges below the Néel temperature, 𝑇N=18K, characterized by a propagating vector 𝐤=(0,0,1.5). Refinement analysis reveals that the copper moments display a noncoplanar arrangement, with the 𝑐 components parallelly aligned within the breathing kagome plane and antiparallelly aligned between the layers. In-plane moment components form a chiral “tail-chase” structure. The magnetic order is quickly suppressed under moderate external fields applied both within and perpendicular to the kagome plane. Potential magnetic interactions that may be associated with the noncoplanar chiral magnetic structure are discussed.
