Barlowite: A Spin-1/2 Antiferromagnet with a Geometrically Perfect Kagome Motif

Abstract

We present thermodynamic studies of a new spin-1/2 antiferromagnet containing undistorted kagome lattices---barlowite Cu${}_4$(OH)${}_6$FBr. Magnetic susceptibility gives ${\theta }_{CW}$ = $-$136 K, while long-range order does not happen until $T_N$ = 15 K with a weak ferromagnetic moment $\mu$ $<$ 0.1${\mu }_B$/Cu. A 60 T magnetic field induces a moment less than 0.5${\mu }_B$/Cu at $T$ = 0.6 K. Specific-heat measurements have observed multiple phase transitions at $T\ll$ $\mid$${\theta }_{CW}$$\mid$. The magnetic entropy of these transitions is merely 18% of $k_B$ln2 per Cu spin. These observations suggest that nontrivial spin textures are realized in barlowite with magnetic frustration. Comparing with the leading spin-liquid candidate herbertsmithite, the superior interkagome environment of barlowite sheds light on new spin-liquid compounds with minimum disorder. The robust perfect geometry of the kagome lattice makes charge doping promising.

5 pages, 3 figures, 1 table

References in corpus (7)

• Spin Dynamics of the Spin-1/2 Kagome Lattice Antiferromagnet ZnCu_3(OH)_6Cl_2
• Spin chirality on a two-dimensional frustrated lattice
• Theoretical prediction of a strongly correlated Dirac metal
• Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet
• Projected wave function study of Z2 spin liquids on the kagome lattice for the spin-1/2 quantum Heisenberg antiferromagnet
• ^{63}Cu, ^{35}Cl, and ^{1}H NMR in the S=1/2 Kagomé Lattice ZnCu_{3}(OH)_{6}Cl_{2}
• Pinwheel VBS state and triplet excitations in the two-dimensional deformed kagome lattice

Cited by in corpus (14)

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• Site-Specific Structure at Multiple Length Scales in Kagome Quantum Spin Liquid Candidates
• Stability frontiers in the AM${}_6$X${}_6$ kagome metals: The LnNb${}_6$Sn${}_6$ (Ln:Ce-Lu,Y) family and density-wave transition in LuNb${}_6$Sn${}_6$
• Metal-insulator transition and intermediate phases in the kagome lattice Hubbard model
• Emergence of the spin polarized domains in the kagome lattice Heisenberg antiferromagnet Zn-barlowite (Zn${}_{0.95}$Cu${}_{0.05}$)Cu${}_3$(OD)${}_6$FBr
• High energy spin excitations in the quantum spin liquid candidate Zn-barlowite probed by resonant inelastic x-ray scattering
• Role of chemical pressure on the electronic and magnetic properties of spin-1/2 kagome mineral averievite
• NMR evidence of spinon localization in kagome antiferromagnet YCu${}_3$(OH)${}_6$Br${}_2$[Br${}_{1-x}$(OH)${}_x$]
• Short-range order and hidden energy scale in geometrically frustrated magnets
• $LnC{u}_3(OH{)}_{6}C{l}_3(Ln=Gd,Tb,Dy)$: Heavy Lanthanides on Spin-1/2 Kagome Magnets
• Topological Aspects of Antiferromagnets
• Magnetism of kagome metals $\left({\text{Fe}}_{1-x}{\text{Co}}_x\right)\text{Sn}$ studied by $\mu$SR
• Fluctuating magnetism in Zn-doped averievite with well-separated kagome layers
• Local probe investigation of the spin dynamics in the kagome and inter-layers of orthorhombic barlowite Cu${}_4$(OD)${}_6$FBr: ${}^{79}$Br and ${}^{63}$Cu NQR study