Magnetic properties of a family of quinternary oxalates

Abstract

We report on the magnetic properties of four isomorphous compounds of a family of quinternary oxalates down to 60 mK. In all these materials, the magnetic FeII ions with a strong magneto-crystalline anisotropy form a distorted kagome lattice, topologically equivalent to a perfect kagome one if nearest-neighbor interactions only are considered. All the compounds order at low temperature in an antiferromagnetic arrangement with magnetic moments at 120°. A remarkable magnetic behavior emerges below the Néel temperature in three compounds (with inter-kagome-layer Zr, Sn, Fe but not with Al): the spin anisotropy combined with a low exchange path network connectivity lead to domain walls intersecting the kagome planes through strings of free spins. These produce an unfamiliar slow spin dynamics in the ordered phase observed by AC susceptibility, evolving from exchange-released spin-flips towards a cooperative behavior on decreasing the temperature.

9 pages, 13 figures

References in corpus (6)

• Low Temperature Spin Freezing in Dy2Ti2O7 Spin Ice
• Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
• Propagation and Ghosts in the Classical Kagome Antiferromagnet
• Investigation of the magnetic fluctuations in Tb${}_2$Sn${}_2$O${}_7$ ordered spin ice by high resolution energy-resolved neutron scattering
• Domain Wall Spin Dynamics in Kagome Antiferromagnets
• Jahn-Teller Distortion in Bimetallic Oxalates

Cited by in corpus (4)

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• Magnetic structure and dynamics of a strongly one-dimensional cobalt${}^{II}$ metal-organic framework
• Striped Magnetic Ground State of the Kagome Lattice in Fe4Si2Sn7O16
• Magnetic State Selected by Magnetic Dipole Interaction in Kagome Antiferromagnet NaBa${}_2$Mn${}_3$F${}_{11}$