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Abstract
Multiple field-induced plateaus in αCoV2O6 at low temperatures were revealed earlier by M. Lenertz et al. [J. Phys. Chem. C 115, 17190 (2011)] and carefully investigated recently by M. Nandi and P. Mandal [J. Appl. Phys. 119, 133904 (2016)]. Four equidistant steps were observed in the magnetization curve. We present a model to describe this phenomenon. A magnetic structure of this substance is formed by highly anisotropic triangular lattice of Ising chains running along the b axis. Due to a three-fold degeneracy of three-sublattice magnetic ordering, domain boundaries appear. Their transformation under magnetic field variation leads to two additional steps in the 1/3 magnetization plateau and gives rise to complex magnetic behavior observed experimentally. The domain structure in αCoV2O6 occurs to be strongly anisotropic because a lifetime of the metastable states depends greatly on the configuration orientation. A strong dependence of the magnetization curve on magnetic field sweep time is predicted.
Highlights
Ising spin-chain compounds have drawn considerable attention due to unusual magnetic behavior [1,2,3,4]
It is interesting to mention that the four-step structure in the magnetization curve can appear in the two cases only: perfect triangular lattice (Ca3Co2O6) and strongly anisotropic triangular lattice (α-CoV2O6)
The nature of the additional steps in the plateau 1/3 observed in this compound stems from metastable states induced by domain boundaries in the 3SL phase
Summary
Ising spin-chain compounds have drawn considerable attention due to unusual magnetic behavior [1,2,3,4]. Very weak next-to-thenearest interchain interactions or anisotropy partially lift the degeneracy of the ground state and produce various low-temperature magnetic structures: the three-sublattice (3SL) one in CsCoCl3 and related compounds, stripes in Sr5Rh4O12 [6, 7], and strongly disordered Wannier’s state [8] in Ca3Co2O6 [3, 9, 10]. At low temperatures two additional steps appear at the plateau They are assumed to be a consequence of a three-fold degeneracy of the 3SL configuration which gives rise to a domain structure [1, 11]. This is a longlived metastable state which determines a slow magnetic dynamics in Ca3Co2O6 [1, 9]
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