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

Abstract

We report ${}^{79}$Br and ${}^{63}$Cu nuclear quadrupole resonance (NQR) in the paramagnetic state above $T_{\text{N}}=15$ K of the antiferromagnetic orthorhombic phase of barlowite Cu${}_4$(OD)${}_6$FBr consisting of a layered kagome structure. The divergent behavior of the longitudinal ${}^{79}(1/T_1)$ and transverse ${}^{79}(1/T_2)$ relaxation rates observed at ${}^{79}$Br sites evidences that critical slowing down of Cu spin fluctuations sets in below $\sim 20$ K. This means that one or more Cu sites, most likely at the interlayer Cu(3,4,5) sites between the kagome planes, undergo the antiferromagnetic phase transition in a fairly conventional way. On the other hand, the ${}^{63}$Cu NQR signal intensity is gradually wiped out below $\sim 30$ K, pointing toward gradual spin freezing of the kagome layers instead. These contrasting findings suggest significant roles played by magnetic frustration effects within the kagome layers.

arXiv commentAccepted for publication in Phys. Rev. Mater. 5 figures

References in corpus (35)

• Quantum Spin Liquids
• Quantum Spin Liquids
• Evidence for a Gapped Spin-Liquid Ground State in a Kagome Heisenberg Antiferromagnet
• Gapped spin-1/2 spinon excitations in a new kagome quantum spin liquid compound Cu${}_3$Zn(OH)${}_6$FBr
• ^{63}Cu, ^{35}Cl, and ^{1}H NMR in the S=1/2 Kagomé Lattice ZnCu_{3}(OH)_{6}Cl_{2}
• Scaling and data collapse from local moments in frustrated disordered quantum spin systems
• Glassy Slowing of Stripe Modulation in (La,Eu,Nd)(2-x)(Sr,Ba)(x)CuO4: A Cu-63 and La-139 NQR Study Down to 350mK
• Barlowite: A Spin-1/2 Antiferromagnet with a Geometrically Perfect Kagome Motif
• Valence Bond Glass Phase in the Diluted Kagome Antiferromagnets
• Quantum spin-liquid behavior in the spin-1/2 random-bond Heisenberg antiferromagnet on the kagome lattice
• Nature of the randomness-induced quantum spin liquids in two dimensions
• Symmetry Reduction in the Quantum Kagome Antiferromagnet Herbertsmithite
• Strong magnetic frustration in Y${}_3$Cu${}_9$(OH)${}_{19}$Cl${}_8$: a distorted kagome antiferromagnet
• Emergence of spin singlets with inhomogeneous gaps in the kagome Heisenberg antiferromagnets Zn-barlowite and herbertsmithite
• Barlowite as a canted antiferromagnet: theory and experiment
• Local Spin Susceptibility of the S=1/2 Kagome Lattice in ZnCu3(OD)6Cl2
• Materializing Rival Ground States in the Barlowite Family of Kagome Magnets: Quantum Spin Liquid, Spin Ordered, and Valence Bond Crystal States
• Single crystal growth of Cu4(OH)6BrF and universal behavior in quantum spin liquid candidates synthetic barlowite and herbertsmithite
• Dynamic fingerprint of fractionalized excitations in single-crystalline Cu${}_3$Zn(OH)${}_6$FBr
• Spin excitations of a proximate Kitaev quantum spin liquid realized in Cu${}_2$IrO${}_3$
• From magnetic order to quantum disorder: a $\mu$SR study of the Zn-barlowite series of $S=\frac{1}{2}$ kagomé antiferromagnets, Zn${}_x$Cu${}_{4-x}$(OH)${}_6$FBr
• Effect of Zn doping on the antiferromagnetism in kagome Cu${}_{4-x}$Zn${}_x$(OH)${}_6$FBr
• Synthesis-Dependent Properties of Barlowite and Zn-Substituted Barlowite
• Site-Specific Structure at Multiple Length Scales in Kagome Quantum Spin Liquid Candidates
• Distribution of the magnetic environment in charge ordered La${}_{1.885}$Sr${}_{0.115}$CuO${}_4$
• Nuclear and Magnetic Structures of the Frustrated Quantum Antiferromagnet Barlowite, Cu${}_4$(OH)${}_6$FBr
• Critical Behavior of the SDW Transition in Underdoped Ba(Fe1-xCox)2As2 (x <=0.05): 75As NMR Investigation
• Revisiting ${}^{63}$Cu NMR evidence for charge order in superconducting La${}_{1.885}$Sr${}_{0.115}$CuO${}_4$
• Magnetic resonance as a local probe for kagomé magnetism in Barlowite Cu${}_4$(OH)${}_6$FBr
• Cu nuclear spin-spin coupling in the dimer singlet state in SrCu2(BO3)2
• Freezing of the Lattice in the Kagome Lattice Heisenberg Antiferromagnet Zn-barlowite ZnCu${}_3$(OD)${}_6$FBr
• Magnetic phase diagram of Cu${}_{4-x}$Zn${}_x$(OH)${}_6$FBr studied by neutron-diffraction and $\mu$SR techniques
• 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
• 63,65Cu Nuclear Resonance Study of the Coupled Spin Dimers and Chains Compound Cu2Fe2Ge4O13