Intra-chain collinear magnetism and inter-chain magnetic phases in Cr3As3-K-based materials
Giuseppe Cuono, Filomena Forte, Alfonso Romano, Xing Ming, Jianlin, Luo, Carmine Autieri, Canio Noce
TL;DR
This study investigates the magnetic properties of KCr3As3 and K2Cr3As3, revealing intra-chain collinear magnetism and inter-chain magnetic phases, and predicts magnetic behavior near phase boundaries in these quasi-1D materials.
Contribution
It uncovers the role of lattice-spin interactions in promoting collinear ferrimagnetism and predicts magnetic states in K2Cr3As3 near magnetic instability.
Findings
KCr3As3 exhibits a collinear ferrimagnetic ground state within chains.
KCr3As3's interchain antiferromagnetic coupling explains the spin-glass phase.
K2Cr3As3 is non-magnetic but close to magnetic instability with interchain ferromagnetic fluctuations.
Abstract
We perform a comparative study of the KCr3As3 and the K2Cr3As3 quasi 1D compounds, and show that the strong interplay between the lattice and the spin degrees of freedom promotes a new collinear ferrimagnetic ground state within the chains in presence of intrachain antiferromagnetic couplings. We propose that the interchain antiferromagnetic coupling in KCr3As3 plays a crucial role for the experimentally observed spin-glass phase with low critical temperature. In the same region of the parameter space, we predict K2Cr3As3 to be non-magnetic but on the verge of the magnetism, sustaining interchain ferromagnetic spin fluctuations while the intrachain spin fluctuations are antiferromagnetic.
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